When to use the Sine and Cosine Rules

[@YoFarhaNBW]

For cosine rule you can say “angle sandwich” because the angle is in between the sides

[@LikeAMathClass]

That’s a great way to remember it!

[@EsauVinarang-xz1se]

Thank you very much ❤

[@LikeAMathClass]

You're welcome 😊

[@melokuhle1721]

Thank you

[@LikeAMathClass]

You're welcome. And thanks for watching and letting me know that it helped.

[@belugacat4599]

You forgot about Pythagoras Theorem for right angle triangle

[@LikeAMathClass]

You are absolutely right! How could I forget the very foundation when we start learning about triangles and trigonometry? Thanks for the catch!

[@osk-wg2di]

😂​@@LikeAMathClass

[@Ecea_01]

How about if there are only two angles are given, is that possible to find the missing side?

[@LikeAMathClass]

For the Sine and Cosine Rules, you always need 3 pieces of information. With that information, at least one piece needs to be a side if you are going to solve for any of the other parts.
Imagine if you drew a triangle with technology. You could zoom in and zoom out all you want. The side lengths would all change with every zoom, but all of the angles would still be the same. That’s why you need at least one side to “lock in” the triangle to one fixed size.

[@Ecea_01]

@@LikeAMathClass thanks bro! That was a great explanation...

[@mehakarham5156]

What is soh coh toa?

[@LikeAMathClass]

SohCahToa is an acronym for right triangle relationships.
Soh is sine = opposite side / hypotenuse
Cah is cosine = adjacent side / hypotenuse
Toa is tangent = opposite side / adjacent side

[@dstat79]

🙏🏻

[@LikeAMathClass]

🙏

[@GabrielAnkomah-u9m]

😢 not helpful

[@LikeAMathClass]

Oh, I'm sorry to hear that. What question(s) do you still have that maybe I can help with?