Hypotenuse calculator

Find the hypotenuse (or any missing side) of a right triangle using c² = a² + b².

Side a Side b

c² = a² + b² → c = √(a² + b²)

Where c is the hypotenuse (longest side, opposite the right angle) and a, b are the two legs.

3-4-5 (and multiples: 6-8-10, 9-12-15, 15-20-25)

5-12-13, 8-15-17, 7-24-25

These are right triangles where all three sides are whole numbers.

If you know the hypotenuse c and one leg a: b = √(c² − a²)

Example: hypotenuse = 13, leg = 5 → other leg = √(169 − 25) = √144 = 12