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About the Pythagorean Theorem Calculator
This calculator finds the missing side of a right triangle using the Pythagorean theorem. Enter any two side lengths and it returns the third value with a step-by-step solution. It works for both legs and the hypotenuse.
The tool applies the standard formula a² + b² = c², where a and b are the legs and c is the hypotenuse. To find a leg, it rearranges the equation to a² = c² - b². You only need two known side lengths in matching units. Identify the hypotenuse first, since it is the longest side and sits opposite the right angle.
- Enter the two known side lengths with their units.
- Select which side is the hypotenuse, or mark it as unknown.
- Read the missing side length and review each solution step.