# Law of Sines… How? When? (NancyPi)

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Published on May 5, 2020 by

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If you need to "solve the triangle" in a trigonometry problem, it just means to find all the missing angles and sides of the triangle.

WHAT is the LAW of SINES? Say that you're given an oblique triangle, meaning one that is not a right angle triangle, and you need to solve it. If you know two angles and at least one of the sides, you can solve with the Law of Sines trigonometry formula. The Law of Sines says that the sine of one angle over the side opposite that angle, equals the sine of the next angle over its opposite side, which equals sine of the last angle over its opposite length. These three ratios equal each other, and you can use these proportions to solve for unknowns.

Say that you're given that angle B is 34 degrees, angle C is 110 degrees, and side b is 14. We know two angles and one side. What's missing, or what we're looking for, is side a, side c, and the measure of angle A. That missing third angle, angle A, we can find very quickly without using any special new law or trig identity, since the sum of the degrees in a triangle is always 180 degrees. Subtracting the two known angles (34 and 110 degrees) from the total 180 degrees gives that the measure of angle A is 36 degrees.

HOW to use the Law of Sines: to find the missing two side lengths, we do need the Law of Sines theorem. First write all the ratios from the Law of Sines: the sine of each angle, over the length opposite. We write the sine of 36 degrees over the opposite side, side a. This equals sine of the next angle, 34 degrees, over its opposite side 14. And finally, that equals sine of the last angle, 110 degrees, over the opposite length, the unknown c.

If we look at just the leftmost two ratios, we see that we can use that equation to solve for a. So we separate that part out to solve: sin(36)/a = sin(34)/14. An easy way to solve a proportion like this is to cross-multiply. This gives us 14sin(36) = a*sin(34). Now it's more clear how to solve for side a, by just dividing out sin(34) from both sides. So we get that a is equal to 14*sin(36)/sin(34). To get a number value that's practical as the length of a triangle side, you can use your calculator to get a decimal number. CAUTION: since we were given angles in degrees, make sure your calculator is in degree mode, not radian mode, so that you don't get the wrong answer. The side length a is then approximately 14.72.

Now there's just one more unknown to find, the side c. To find the remaining missing side of a triangle, you can use a different pair of ratios to solve, the equation with the rightmost two ratios: sin(34)/14 = sin(110)/c. In general, to solve for one of the unknowns, use the ratio that has what you want to find in it, as the only unknown, and set it equal to a ratio where you know everything already, and you will get the answer. We cross-multiply to get c*sin(34) = 14sin(110). When we get c alone and use a calculator, we find that side length c is approx. 23.53. Now we've completely solved the triangle for all the missing sides and angles.

How do you know WHEN to use the LAW of SINES? If you're given two angles and a side (AAS or ASA cases), or two sides and an angle opposite one of those sides (SSA), you can use the Law of Sines property. If you have two angles and one side (AAS/ASA), you can use the Law of Sines just as we did to find the missing sides. WARNING: for the SSA case, when you have two sides and an angle that's opposite one of them, you can also use the Law of Sines to solve, but instead of having one solution, there may be no solution or two solutions. The SSA case is also called the "ambiguous case".

For more triangle solver math help as well as videos with trig identities, trigonometry problems, geometry, algebra, algebra 2, and calculus, check out: http://nancypi.com

Editor: Miriam Nielsen of zentouro @zentouro

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Can you show me the math that allows you to have stopped the ageing process?
Your face and skin are apparently not following the mathematical norms of getting older.
You’re not only a great mathematician, but a rather attractive one to boot.
Which reminds me of a famous quote, “To boot or not to boot, that is the hardest drive.”

Just saying,

LG

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Please make a vid on second order derivatives…

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• On behalf of my students trying to work through the Law of Sines during the “at home learning” portion of this very interesting school year, I want to say thank you for the excellent tutorial on what is often a confusing topic. I hope that more students can appreciate the work into creating these videos and take advantage of them, and others, to help support their education in the information age. – @Osterclass

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I am particularly interested in holography and lens less microscopy.

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• Respect โค๏ธ

• Great love from India ๐ฎ๐ณ๐๐ฎ๐ณ

• Please upload more often ma’am. Please make a series on India’s NCERT curriculum if you can. You’d get millions of viewers. Indian students need you! ๐

• I already know all this, but still watch your videos because you are cute

• Thank you for your help. โบ I do love you my teacher. โค

• Great to see from you after a long time.It would be great if you cover euclidean geometry for math olympiads.

• Trying my best to pay attention but I get distracted.

• Yo does she got a insta! I need help with math

• omg her voice is amazing…

• Your video is so nice mam…
Love from India.๐๐๐

• I’d like to keep the clockwise form , the Angle Side Side

• oh thank god your back, i was scared id have to actually attend lectures

• Nancy thank you for all the help you are doing for students over break who are struggling. Would it be possible for you to make a short video on lโhรดpitals rule. That would be great. Thank you.

• Your videos are awesome. Keep up the good work. I can’t help but wonder , what do you do to make your writing so clear. What cameras do you use? How do you capture your voice?

• nice video, i am also a mathematician, can you tell me that which software you are using in your videos

• It’s soo refreshing to see u

• You have come back !!!

• Yey…. your back Nancy-pi …….. not a math person but thereโs always something one can learn from a talented educator plus your sweet presence ๐

• You are smart and beautiful

• Marry me plz. ๐ ๐ ๐

• Great to see you!!! Hope all is well. Ready to have you back full time.

• She writes it all backwards left handed!

• ya abiii nerdesin geliyim buliyim seni ya

• The best side of having known english is YOUUUU

• ok i’ll say it…*writing backwards is more impressive than actually doing maths*

• I didnt notice that at the beginin…
Something is up

• Must be a mirror app thgh

• NancyPi is the best.

• after long time you uploaded a video

• everyone asking how she writes backwards, no one wondering how she talks from behind the glass

• Yay, you’re back!

• Nice

• I love u. U r awesome

• Please mey what board you use to write.

• Glad you’re back on and posting videos again!

• What she is using for writing.can anybody tell me pls. Is it any app or software?

• Mam i am also a teacher and it will be a great help if you let me know the application you use for such kind of video interaction. ..๐

• Nice lecture

• from where you are mam

• dont stop making videos you make more sense than my professor

• U r very pretty sis

• please make some classes on integral calculus!!!!!!๐๐๐๐๐๐

• Great to see you back Nancy. Hope to see more videos soon. You’re a fantastic educator.

• Can u teach applications of differentiation?

• I want to use LOVe Sign on u . how u write this ? please tell me

• well another video comes after that corno ends i guess๐๐๐

• I am Happy to see you back in action! Thank you,

• Sheโs back yessirrr

• What did you major in at MIT ?

• It would be nice to show a proof for the Law of Sines.

• thanks

• You voice is so cute

• yay, you’re back, have missed the knowledge that you’re willing to shear.
Your vids helped me get through Engineering Degree Maths.
kai mihi, te hauora pai, kia kaha

• I can’t focus,. Help me!!!!!

• i can solve it with two methord …

• low of sine….

• ms nancy pi happy teacher’s day

• hocam at gibisiniz maลallah

• Are you even real?

• nice

• Can you make vedios for jee mains

• You are so hot and sexy

• So, Are you married now ?

• I just love the title of ur videos! ๐

• Thank Ma’am ๐

• I’m not here to learn the Law of Sines if you know what I mean!

• I like 10000 times how u explain my world best

• No se que dice por que no entiendo el Inglรฉs JAJAJAJAJA pero, Galileo Galilei decia: “Las matemรกticas es un idioma universal” se puede ver video en otro idioma y entiendes perfectamente. Ya conozco estos temas, pero me los verรฉ todos por que se hizo mi crush la del vรญdeo

• Where were you? Nice to see you back!

• I am studying from India good teacher

• could you please please do more videos….i missed your classes..i’m a huge fan and you are a life saver.

• Me likie

• ยฟCan’t be subtitled with other languages?

• Upload videos on vector algebra

• You might not like maths, but you can like my videos and subscribe.

Done. ๐

• Thank you Nancy love from Africa ๐

• holy crap i thought this channel went defunct. GLAD TO SEE YOU BACK NANCY

• Beauty with brains. ๐ฅฐ

• MAM in such situation you are our support keep uploading videos and stay safe

• Delighted to see you! How are you doing? I wish you all the best! PS:…The words “Don’t panic.” coming from a mathematician is a bit alarming….;-) Though, that it is spoken with one of the most reassuring and calm voices I know, helps a lot!

• Love u Lucy my best teacher want your more beautiful videos like you

• Your channel is very beautifulโบ.
We also have a math channel in Spanish๐๐. What kind of blackboard do you use so that people can see you and what you write?

• Upload full video of properties of โ

• Is she real or is it a robot?

• I like Math. Join me. Thanks. New friend.

• Can we chat,dear

• HI NANCY. . GOOD JOB.
HOW CAN I USE TRANSPARENT BOARD LIKE YOURS ?
WITH THANKS. โบ

• i don’t like math or your videos

i like you
(jk your videos are awesome! sometimes, i have dreams about you being my math teacher; i never skip class <3)

• nice video

• You’re such a fucking beautiful…

• Nancy pi a qt3.14

• ๐ช๐ช๐ช๐ด๐ด๐ด๐ด๐ด๐ด๐ด thumbs down

• Thanks for the informative videos. Easily understandable. Will you make similar videos for cosines, tangent, secant, cosecant, cotangent?

• How can you write it that way?

• who knew math was so hot

• Wish u were my math teacher and smooth with the like

• if u need a bf look no further ๐ slide my Dm’s

• I would love to see your take on solving some of these so-called ‘Viral’ math problems running around Facebook these days like 6 / 2(1 + 2). They create arguments that go on for days. There’s another one with Horses, Horseshoes and boots. It’s a set of Simultaneous equations. Yet arguments ensue… Your thoughts? Thanks!

• can you please do videos on computer science or something related please!

• Looking very ๐๐๐๐

• ๐ฅฐ๐ฅฐ๐ฅฐ๐ฅฐ๐๐๐๐๐๐๐๐๐๐๐๐๐ฅฐ๐๐ฅฐ๐ฅฐ

• Perfeito! The best teacher, I liked it here in Brazil!

• only once in 6 months๐ข

• Tbh i was only watching her the entire time

• ๐
๐
๐Hermosa
๐
๐

• Want Video on INTEGRALS and APPLICATION OF INTEGRALS

• Your lectures are a treat to my eyes.

• #lrnwthdeepika

• No la entiendo del todo pero es hermosa.

• Nice and amazing

• ๅฏ๏ผๆฏๆ่ฏๅพทไธ่ง่คฒๆถตๆฐๆฎ๏ผ๏ผ๏ผSO๏ผ??ใ

• Just here to say Thank you because I passed Algebra 2 with a B.. but uh haha Iโm free Friday night.

• Good video ๐i like it ๐ฏ๐

• This video reminded me that I need to look for how to solve SSS which is law of cosines. Thank you so much and I’m glad I just discovered your channel.

• My name is Muammar Kamal
I am Iraqi Math teacher

• You are so beautiful and prettier , thanks for video

• Nice

• expontial how can calculated can you understood

• hi

• Are you satisfy why unit circle don’t have unit area but still it satisfy all the conditions of math and physics and so on ,but if we take 1/โฯ. as radius of circle and it’s still satisfied all the trigonometry conditions ????

• Use the bhagwati shakti trikon

• How I talk with you

• I noticed you are left handed ๐ You are also an excellent teacher. I wish you would have been around when I was taking differential equations ! Have a blessed day

• I was really waiting for this video

• Welcome back Nancy!

• Perfect combination Beauty+intelligence=Nancy

• I watch your video eve though I know all these stuff!!

• HOW YOU ARE WRITING ANY TOOLS PLS INFORM ME

• Liked!

• Hi Nancy! Can you please make videos on Sets

• Omg
How does she writes in inverted/mirror?

• You are great and your videos really useful! But honestly, I’m glad that the teenager version of myself didn’t study with a teacher like you but with the fleshless books. I could focus just the math ; )
I wonder, does people here notice the great work you’ve been doing to realize these simple, concise, yet thorough explanations? And did anybody realize that the video must have been flipped horizontally, to be read correctly, and that we are seeing the horizontally-reflected version of your figure? Just wondering.

• I just watched *most* of your q&a from 2018. Has anyone figured out your wizardry? I love to figure such things out. I will only mention that your dominant hand may not be the one it seems to be, and note that inverse and opposite are different transitions. Thank you for what you do here!! ๐ Signed, someone who only recently discovered engineering and maths are super exciting after dismissing the subjects for a long time, and whom has pretty much no friends from pre-this interest to talk with about this stuff. Thanks again!!!

• I love you mame

• ๐๐๐๐ท๐ท๐ท๐๐๐๐ท๐ท๐ท๐๐๐๐๐๐๐๐๐๐ท๐ท๐ท๐๐๐๐๐๐๐๐๐๐๐๐๐๐๐๐ท๐ท๐ท๐๐๐๐๐๐

• Hi,

• ๐ค๐ค๐ค

• I Love mam aap se pyar kr te haโคโคโคโคโคโคโค๐๐๐๐๐๐๐๐๐๐๐

• Ye hindi janti h dost

• ๐คฃ๐คฃ๐คฃ…

• Iam a Btech 2nd year student..and i don’t know what iam doing here..

• Yayyyyy, you’re back! ๐ Are you enjoying the Covid Apocalypse? I hope all is well in your world. Cheers.

• ููุทู ูุดุทู

• Interested vdo

• so f***ing beautiful, feminine and smart woman?! I can’t believe that!

• Woman are a complex maths equation complicated lol

• Hello, I demand that this beatiful teacher make an integration by partial fraction, I hope i can see how she would explain it? also liked and subbed though

• Mam you are so beautiful

• *Islam is the beuty for all humans specially for womans please read slam coz slam is perfect not muslims—allah(god) ordered for womans to take hijab to cover their beutiful body–this is good for your health and others!!!!!!please read slam!!!!*

• Excellent explain ๐
Brain with beauty ..

• Very nice explanation ma’am thank you so much you are great

• I thi

• Nancy you are a excellent teacher love you very much

• I am doing my graduation ..I don’t know why I am here !!

• Hottest Math teacher on youtube

• you’re pretty๐๐

• I got finals this week and studying during Quarantine was super hard! thank you for your videos

• Love u mam im from india

• so beautiful

• Love it

• Which board or software u r using to write in such a way?

• Hi Nancy what the name of application that you use to flip vedio please tell me send the name

• there’s lot of programs that can do it, I believe you can flip video with openshot, which is free and open source

• btw law of cosines could have also been nice <3

• Quarantine has all the content creators coming back.

• el tema es muy sencillo ,pero la maestra es muy guapa

• You are as beautiful as math.

• U are so beautiful ๐๐

• Hi. Hi. I would like to start reading math from the beginning ,. How do I fallow the path of mathematics videos

• I can’t learn trigonometry by this way, Not only because She is a beautiful girl also she has soft voice.

• Aw! back againโค๏ธโ๏ธ

• Where were u? I waited so much ๐ญ๐๐ญ to

• I think I pass my numerical test if she was teaching me cute lady omg

• Is it me or does she have very long arms

• Nice tuitor, I admiring you

• It’s amazing how you write everything backward so it appears right side up,very smart

• Just a simple video editing trick. Video is flipped

• Why don’t I have a beautiful teacher like you ?

• Nice classe

• Impressed

• โa+b=11
a+โb=7 then prove a=4 and b=9 miss Nancy please solve it

• Nice,,,common d: come to my YouTube channel

• You should do another Q&A video

• Non threatening Maths, great!

• NancyPi is Very Hot!!!

• hi,great videos,canyou helpwiththis In a race the probability that Tom wins is 0.3, the probability that Mathew
wins is 0.2 and the probability that Jerry wins is 0.4.
Find the probability that
(i) Tom or Jerry wins,
(ii) neither Tom or Mathew wins.
Assume that there are no dead heats

• Wow! Beautiful teacher. It is never too late to learn.

• รtimo . Adorei a explanaรงรฃo.

• NancyPi I love the wild child is inside you

• NancyPi, do you have any idea how many want to have the amount of subscribers that you currently do? We wish to see more videos of you explaining things, in ASMR style, as you always do. Teach us arithmetic, simple math things.

• Yay, welcome back!

• I am an electrical engineer here in Brazil. I’ve always been passionate about math. But, in love with the teacher is the first time. Thank you for your work.

• Thank you for helping me pass my FE exam. -someone that never took college level math. Your videos were my go-to for learning calculus, and I tried at least 3 books, but didn’t get the ah-ha moment until I watched your videos.

• WTF! Is she writing on glass from her right to left with flip words? I’m so confused. ๐ฒ

• how u do this on screen can u please explain it
i mean writing on the screen

• law of cosines? when?

• Muy bueno!

• Dang… fine and smart wifey material

• Maths girls are wife material!

• PLEASE how you are writing (on a screen or a board ) and why it’s not opposite ?

• How to calculate valu of sin34

• I saw you and I gave like

• Most attractive woman on YouTube….by far!

• Mam you are very cute๐๐๐๐๐

• Nice method

• Madam jee rauaa kaha se bani

• Intelligent and beautiful ๐๐

• Precious girl! And what a great teacher.

• Lo ando viendo el la bella cuarentena

• When did you become an expert in Trigonometry?
Me: Well, it’s complicated.

• I mean u are very tired and stressful lady.
Level of difficulty is zero in your content.
In India 5ths class student solve your question s by getter approach!!!
Jai Hind!!!!!

• which software do you use?

• Hey. Hii can i get a video on legendre polynomials . Plz its just a lot of pain.

• No big deal. Trigonometry is very easy. Every mathematician knows.

• you aer good teacher thank you

• Hola.
ยฟNo puedes explicar en espaรฑol?
En ingles no entiendo.

• Nc

• Professora linda๐

• Can you please tell which application u r using here to teach
It will be highly obliged

• You should make courses on Udemy. I would definitely buy them.

• Western culture is worst no respect interaction between teacher and students

• Can you provide me editing method like this vedio

• Hi Nancy, I am a teacher from Iraq. What kind of board do you write?
Thanks

• Teach us how to do Mathematical Induction & Strong Mathematical Induction. <3

• Now shes ruining my good night sleep ๐

• math=mental abuse to humans

• Wow thรฌ ra lร  ฤang o chuรดng em bรฉ mat me nhแป hehehe ha ha ha

• ๐ฒ๐ท๐ฒ๐ท๐ฒ๐ท๐ฒ

• Fantastically delivered in such a simple and lovely manner
Hope to be like you someday
Mathematics Teacher from Nigeria

• Killer dress, needs a plunging neckline though.

• Thanks Nancy for this fine presentation. Pythagoras would be proud of you, but don’t go near the square root of 2, he will get all spastic. To work these type of problems, I use the web to find a table of trig. ratios. Looking forward to your next video.

• nancy you are so beautiful love you! i like the way you teach us!

• Iโm not even in school anymore but couldnโt resist watching a new Nancy video!

• she talks like Mark Ruffalo

• Oh My God, you are here again.
Thank You.

• From top to bottom u look like India’s Nora Fategi.

8 y ^ 2 = x ^ 2 – x ^ 4, 1/3 ^ (1/2)

• Love your videos, Nancy. Thanks to you, my master studies were not that hard. Hope we can see more of your videos in the future.

• I’m watching math for fun

• How you are doing this… I mean how you are making video…Tell me

• Thank you for shedding a little light!

• Nice๐ฅฐ

• I love how there like 50 dislikes yet thereโs 3.4k likes ๐

• Can you arrange a series of video on thomas calculus please

• how do you do the writing?

• woow prefect you calculating the math like alberto Einstein i liked ๐ฎ๐ฎ

• can got phone

• Why does it seems to like like LAMIS THEOREM…..

• How come everytime you say don’t panic I start to panic.

• Sorry for this type of comment, but I am simply a man.
It is awesome when such a beautiful woman speaks math ๐
This is the only semester I failed in all of highschool because of my teacher, went back and passed it in 2 days in summer school with a different teacher, wish I had you then!

• Nancy is the best!

• Hey madam how are you? ?

• W
hen you realise that she is writing backwards.

• Oh my the way she write backward is truely insane๐ฏ

• I like your way of teaching very much can you please make videos on parametric differentiation

• I felt sleepy with your voice ๐ด๐ด

• You’re so beautiful

• Assuming that all of the angles and length of the three sides are known or have been calculates using the law of sines, knowing that the usual formula has been calculated using the one-half of base times heights, without going through the very messy process of calculating the a height, is there a procedure or formula for calculating the area?

• im angry because i know you would reject me.

• I will watch any nancy pi video, even if I know how to do this already.

• Mam aap hot ho

• I love how you speak. It is charming and makes me feel relaxed and when I am doing any math I like to feel relaxed. Also, do you write on glass or what because I want to know? To add how hard is it to write backwards? I am also a lefty too and I hate writing in books because I have ink or lead on my hand afterwards? thanks for the awesome video and would love if you could answer my questions. thanks again.

• It’s the lightboard, actually she is not writing backwards she writes normally like us but flips the video during editing

• I am studying bsc maths . but I can’t see such a beautiful maths teacher in my whole education career.

• I like the way you teach Nancy, thank you for the hard work you put into your videos. You deserve more subscribers.

• Great seeing you again.

• Owhhh thank U for the explanation

• I want you to update every week. Please come back!!!

• I love your approach, you make maths more easy, keep up the good work.

๐๐

• I love you

• Hey Nancy, could you also do how to factorize cubics, please?

• Hey Nancy, do you write backwards on glass? Or do you have special software and a pen? Thanks!

• nice way of teaching love it

• Nice…teaching #MasterMathematics

• Glad to see you back Nancy!

• Is she writing backwards? That would be crazy good lol

• I can’t focus cause she is too pretty.

• Nancy! What software do you use to write on your video?

• Hi Nancy can you make a video on complex number

• Please excuse me, I’m sure I’ve asked before but,… please do a post about the Fourier Transform,… I could really use LaPlace but I’m a menial electrical engineer,… I just need Fourier …

• Ma’am how do you shoot your video

• I’m falling in โค๏ธ love with Mathematics after seeing your videos. I guess you might be the reason behind how the term ‘The Beauty of Mathematics’ was coined.
-Love from Nepal ๐ณ๐ต

• I’m in love with math after seeing u….๐

• if I had such kind of teacher, I’d definitely become the best educationist in the world ๐

• Hi nancy

• You talk where well

• Gr8t
I can’t understand a thing I am in middle class I don’t know what are these identities for
However I have liked your video
And I will come again after I have grown up a little bit.

• ๐ can you make more Video for class 11th and 12th….

• thanks for holding my hand through math class

• I love this. I just discovered your page, and I want to say thank you. I am a computer science major, and I go against the stereotype. Some people dont believe in my dreams because of it. Thank you for going into what you love, no matter if you fit some mold that was set by society for every carrier option out there. I appreciate your mark on the world.

• These trig formulas are extremely valuable in the building trade. Not all angles are right triangles. Knowing this stuff saves you from holding up heavy pieces of lumber (or steel) and marking the angle, or taping the lengths while leaning out over a thirty foot roof. Give it a try, thanks for the video.

• You are a maths Angel, really…

• I like her, your voice reminds me of Dakota Johnson!!

• ุฎูุด ุดุฑุญ ุจุณ ูู ุงุญุณู ูู ุญูุฏุฑ ูููุฏ ๐

• I donโt get it

• Hi Nancy. Have you ever looked at Big O notation in regards to computer science? Everyone is soooo bad at explaining it. Basically it boils down to calculating runtime and memory cost of a function.

Not sure if you could do a series on it, but since you’re obviously good at math, there’s really not any “code” going on at all. Simply all theoretical math. I bet it would get a ton of views.

• Can we be friends ?

• ๐ธ๐๐ฅ

• How tf does she write in backward thats amazing af

• Can you do stats equations

• How the hell does she writes all the things in reflected form so that it appears correct to us…..

• How the hell did u learned to write backwards

• Hi Nancy,

I know my comment is a month late ๐

I really enjoy your math teachings.

But I’ve got this esoteric soft copy book I would like you to help me look out. It’s essentially logarithms, like advanced logarithm problems. I would love to get it across to you. I would love that you see it, because it could go a lonnng way to help me.

Cheers Nancy ๐

• Your explanations are always very clear.

• I love you nancy

• ุดุฑุญ ุฑุงุฆุน

• Darling kya bable he

• For every video you make i’m so very thankfull!!

• hey Nancy, great video. Me and my frieds love to watch your content. My current math teacher, mr edwards is great, however u are greater. Just wondering what your skin care routine? need info for assignement. Is ur last name actually Pi or is that a stage name?

• My crush is back.. welcome ๐๐ฅฐ

• Good video great material Iโm a maths teacher myself , use these questions for my students . And not bad looking either so Iโm all signed up !

• You should upload more videos

• Mam plz tell me from where are you this is my dream I tend to meet you

• I see now…

• GREAT work as usual.. love your videos. I am required to teacher some of my math classes online starting in September “thank you COVID 19” and i am interested in the writing system you are using. So far i think it’s the one that will work best for me. Can you share what it is and or how to set one up?

• Dear NancyPi,
I am taking Calculus 2. Can you please make a video about disks and washers and when to use either. Also can you please do 4 problems? Problem 1, disks about the x-axis. Problem 2 same problem, but this time about the y-axis. Problem 3, washers about the x-axis and Problem 4 the same one, but about the y-axis. You don’t have to solve them. I just have trouble setting up the problem. The integration is the easy part. The hard part is the setup. Please dumb it down as much as possible. This is the 2nd time I take Calculus 2 and I still do not understand it.

• Domanic Marcus check out the organic chemistry tutors video

• You make math beautiful ;]

• yoooo my g nancy

• You brought the humor on this one! Awesome video.

• Hot teacher beautifull

• Do you write on a glass in front of you!
It’s so amazing!

• what’s the system that u use in your system ?

• me im going to learn watch all the videos from math how does it work to solve the problem

• i think its called geometry law of sines

• because the shape and letters are familiar to me hahhaha

• which means when you using sines of letter and using to equal the sines and put in number of degree i think it is? do you because im not very good at math hahaha

• Helo mam

• No one:

Absolutely no one:

NancyPi: This is how you solve for non write triangles *while global pandemic*

• hey nancy pls make regular videos about advanced topic in maths , with a month that help me a lot ,
we are from kerala (india ) your videos help me a lot , and i find that same videos in different playlist appers

• You are the perfect example of beauty with brain ๐๐๐๐๐๐

• I wanted to thank you for your videos. Your videos on integration got me an A in physical chemistry! I loved the class, mostly because the math made sense because of your lessons. Thank you!

• Calculus 3 and differential equations please !!

• I have been following thus chanell, hoo my goodness, this is so steady and clear. I always check on this channel to see new uploads. I got inspired to create my channel too. You are really doing a great job. Thumbs up and looking out for more

• Very nice nancy. I impreesed with ur method. I wanna follow u plz guide me

• wOW Great to see you back ! Welcome back you are our hero and super helper indeed thank you so much

• Madam can you please tell me what kind of board that you are using and tools..?

• U re beautiful โค๏ธโค๏ธ

• Mam pls upload videos fast I really need it๐๐๐

• Make more videos and upload daily…

• WTF@#k amazing you can Write backwards ? I still dont get eventually i will learn thnx for your wisdom

• Please explain trigonometric ratios and identities

• Wow!! It’s worth watching this video…๐ค

• I’m here not for studie, for watching this beautiful face ๐คฃ๐๐

• Hello can you please explain finance( Simple interest )

• Beautiful ๐ wonderful ๐

• Nice class mam

• Is it wrong to like a teacher?

• Thank you