Pythagorean Theorem Calculator
Calculate the hypotenuse or a missing leg of a right triangle using a² + b² = c².
Pythagorean Theorem
In a right triangle, the square of the hypotenuse (longest side, c) equals the sum of the squares of the other two sides (a and b): a² + b² = c². Use this to find any missing side given the other two.
Right Triangle
Solve For
Side a
Side b
Result
Hypotenuse (c)
5
Area
6
Perimeter
12
3² + 4² = 9 + 16 = 25, so c = √25 = 5