Law of Sines and Law of Cosines (4 Examples)

Learn how to work with the law of sines and the law of cosines in this video math tutorial by Mario's Math Tutoring. We discuss when to use the law of sines and law of cosines as well as going through 4 unique examples. We discuss how to solve for the missing side or missing angle in a triangle.
Related Videos to Help You Succeed:
Ambiguous Case Law of Sines
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[@rooftoptrading461]

Mr Mario. as a dad who forgot all his math I have to thank you for putting this together. It makes helping my kids a breeze. Thank you.

[@MariosMathTutoring]

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[@klasrem]

This video is a life saver. I want to say you taught this in a much easier to understand way than my teacher did in a week. Granted, I didn't pay much attention on Sines, but I did with Cosines, and I now have a clear understanding of both. My teacher never mentioned anything about Cosines being used on SSS and SAS triangles. You have a really good way of teaching this stuff. Good job!

[@MariosMathTutoring]

Glad it helped!

[@diamond1628]

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[@MariosMathTutoring]

You’re welcome! I’m glad this video arrived at the right time for you!

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I really frustrated with this due to taking it online, but this video has helped me understand it more thank you.

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Long time viewer. Great instructive videos. Thank you.

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[@MariosMathTutoring]

Glad it was helpful!

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Glad my video arrived at the right time for you Wang!

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[@MariosMathTutoring]

Happy to help

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[@MariosMathTutoring]

Glad my video helped you!

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[@MariosMathTutoring]

Glad it was helpful!

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[@MariosMathTutoring]

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[@MariosMathTutoring]

You’re welcome! Best wishes to you on the SAT!

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[@MariosMathTutoring]

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[@MariosMathTutoring]

Happy to help!

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I like how he simplifies things.

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Thanks sir, it was very helpfull

[@MariosMathTutoring]

Glad to hear that!

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[@MariosMathTutoring]

Glad my video helped you Lisa!

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[@son-ce3gr]

hey what if you’re given a triangle without labeling sides ABC respectively and there’s a missing angle at the top?

[@CookiehsAndDreams]

I might be a little late on this and I don't fully understand it either, but if you have the angles of the other two sides, you should be able to just subtract those two angles from 180, you should be able to get the missing angle. I might be wrong, but I hope I could help a little!

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[@user-zv5ik3ei4h]

For the first question what do I type in the calculator?

[@molindahenry6748]

How do we plug in the cosine ratio into the calculator because I keep getting larger numbers instead of 6.7 6:37

[@chellianrainnefrias8695]

Thank u so much for explaining this,but when it's comes at the end of (Bcos)I still don't understand how did you get the 225=121×81-198cosB

[@oluwakemijoy6291]

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[@bitoraima3435]

An 18m cable is connected to the top of a 14m radio mast and fastened to the ground at an angle theta to the horizontal. 1. Draw a diagram to illustrate the problem? 2. Calculate the theta in degrees correct to 2 decimal places? Post your ASAP??

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[@MariosMathTutoring]

Great job!

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Thank you johnny sin teacher

[@omega3594]

Hi! at 8:28 shouldnt it be +198 to cancel -198? why is it also negative?

[@learnology3611]

Yah u r right

[@noahwilmerdevera4384]

How did you get the the 96 in 8:45 ??? Can you pls explain sir

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[@thropops138]

in 5 minutes you explained what it took my teacher like 7 weeks to even do half

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anyone else's teacher not teaching them and giving them these videos instead? rip

[@ashakirdak4897]

Will you explain ? (e^ix)= cos x +i sin x With examples

[@cal8869]

im asuming that you figured it out

[@leeno44]

I just need help with the calculator how did u get .805 I couldn’t get it

[@erikabiggs6501]

Hey just a little thing but maybe show us what your calculators says zoom into the calculator or show the camera it so we can see the weapons you push

[@Wesso2803]

bro saved my ass, thank you.

[@oliviapositano8145]

Can you explain how you got 6.7 in the first cosine law example

[@MariosMathTutoring]

This more recent video I did may explain it better for you: Law of Sines and Law of Cosines (Complete Guide) kzbin.info/www/bejne/rmHCp4ZnadKIqpI

[@bambiii787]

Wait how did you multiply by inverse of cosine with no degree measure

[@snebbs25]

At 2:36 he says that the angle is 53.6 but when I put it into the calculator I got 53.61 so wouldn’t it be 53.6? I’m so confused 😢

[@wxrd_]

2:02 why did u multiply by 6, is there any other way to solve without multiplying by 6?

[@MariosMathTutoring]

You want to get the sinC by itself….another option is to cross multiply to get rid of the fractions. Hope that helps!

[@vkaygee]

@@MariosMathTutoring how did you get the .805 and what did you multiply to get 53.7?

[@kuroe5868]

help how do I get the inverse cosine on the calculator? TT

[@MariosMathTutoring]

Usually have to press the ‘2nd’ key first then sine, Cosine, or tangent

[@mightyjames6579]

what iff theres no degrees or number inside the triangle

[@eddyherfst2923]

👍

[@LongingAsp]

Yeah I have a quiz on this tomorrow but I can't get the calculations to work out. I put the law of cosine problem into my calculator and I get a totally different number than what you got

[@ryderdarden2152]

Did you ever figure it out on why it was different

[@alexaltman8106]

@@ryderdarden2152 probably cause it was in radians mode instead of degree mode

[@mikasantos5723]

3:53

[@chrisvfx3737]

Yo bro I approve Strucid

[@WWEfan051905]

Still dumb cause i still dont know how to solve for the last side on the first example😂