# How do i know when to use Soh Cah Toa or pythagoras?

##### 1 Answer

Jun 22, 2018

It just depends on what information about a triangle you are given.

#### Explanation:

The trigonometric functions are used when an angle and a side are known. The Pythagorean Theorem is used when you have a right triangle and two sides are known.

There are many other useful relationships in geometry for solving dimensional problems. One good source is purplemath.com