Right triangle calculator

How it works

Enter any two sides (or a side and an angle) of a right triangle to get the rest.

The formula

Pythagoras: c² = a² + b². Angles: tan A = a ÷ b. Area = a × b ÷ 2.

Worked example

Legs 3 and 4: c = √(9 + 16) = 5, angle A = tan⁻¹(3 ÷ 4) ≈ 36.87°, area = 6.

Good to know

• The hypotenuse c is always the longest side.