Pythagorean Theorem Calculator

The Pythagorean theorem explained

The Pythagorean theorem states that in a right triangle, a² + b² = c², where a and b are the two legs and c is the hypotenuse (the longest side, opposite the right angle). Given any two sides you can always find the third using algebra.

To solve any triangle (not just right triangles), use the Triangle Calculator. For area and perimeter of other shapes, try the Area Calculator. For angle conversions, see Angle Converter.