#1**+2 **

sin A = a/c

cos A = b/c

tan A = a/b

similarly:

sin B = b/c

cos B = a/c

tan B = b/a

You can remember this with " SOH CAH TOA. "

Sine of an angle = length of leg Opposite that angle divided by the length of the Hypotenuse

**S**in = **O**pposite / **H**ypotenuse

Cosine of an angle = length of leg Adjacent that angle divided by the length of the Hypotenuse

**C**osine = **A**djacent / **H**ypotenuse

Tangent of an angle = length of led Opposite that angle / length of leg Adjacent that angle

**T**angent = **O**pposite / **A**djacent

Remember this only works on right triangles! And the "adjacent" leg cannot be the hypotenuse.

hectictar
Feb 22, 2017