Pythagorean Theorem Calculator finds the missing side of any right-angled triangle — enter any two sides (leg a, leg b, or hypotenuse c) and it calculates the third using a² + b² = c². Shows the full step-by-step working including squared values and the square root. Common Pythagorean triples (3-4-5, 5-12-13) are listed for reference. Useful for geometry homework, construction, and physics problems. Runs entirely in your browser.
The Pythagorean theorem states that in a right-angled triangle, a² + b² = c² where c is the hypotenuse. Enter any two sides to calculate the third. Used in geometry, construction, navigation, and 2D/3D vector calculations.