A

mnemonic for the relationships between the

sine,

cosine and

tangent functions to the lengths of the "opposite", "adjacent", and "

hypoteneuse" sides of a

right triangle. (The way it was told to me, "Sohcahtoa" was the name of a mathematician Indian chief.)

SOH: **S**ine = **O**pposite / **H**ypoteneuse

CAH: **C**osine = **A**djacent / **H**ypoteneuse

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