SOH stands for Sine=opposite over hypotenuse.
CAH stands for Cosine=Adjacent over hypotenuse.
TOA stands for Tangent=Opposite over adjacent.
I promise this will make sense soon.....
Sine,Cosine, and Tangent are Trigonemetric Functions used to calculate side lengths and angles of a RIGHT TRIANGLE when few measurements are shown.
Here's a little picture to help you know what side is opposite, which side is adjacent, and which side is the hypotenuse in a right triangle.
An example of using trignometric functions:
First there are two ways of using SOH-CAH-TOA.
One way is for finding side lengths.
EXAMPLE:

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