Trigonometry Triangle Calculator

Use this free trigonometry triangle calculator to solve a right triangle from two sides or a side and an angle.

How the trigonometry triangle calculator works

Pythagoras: c² = a² + b². Angles come from sin A = a ÷ c and tan A = a ÷ b.

Frequently asked questions

What is SOH-CAH-TOA?

A memory aid: sine = opposite ÷ hypotenuse, cosine = adjacent ÷ hypotenuse, tangent = opposite ÷ adjacent.

Results are estimates for general information only. They are not a substitute for professional advice where applicable. Found a mistake? Report an error.