Question

How do i know which one to use?
SOH-CAH-TOA

Answer 1

SOH is Sine: Opposite leg on Hypotenuse.

CAH is Cosine: Adjacent leg on Hypotenuse.

TOA is Tangent: Opposite leg over Adjacent leg.

Explanation:

Depending on what you ask to find the problem.

Answer 2

S is sine, C is cosine and T is tangent

Explanation:

For sine, it's Opposite/Hypotenuse

For Cosine, it's Adjacent/Hypotenuse

and for Tangent, it's Opposite/Adjacent.

Hope this helps.