Pythagorean Theorem
Find the hypotenuse or a leg of a right triangle from two known sides.
Formula
c = √(a²+b²)
The square of the hypotenuse equals the sum of squares of the two legs: c² = a² + b².
Examples
3-4-5 triangle
5-12-13 triangle
8-15-17 triangle
Frequently Asked Questions
What is the Pythagorean theorem?
In a right triangle, c² = a² + b², where c is the hypotenuse.
Can I find a leg if I know the hypotenuse and other leg?
Yes: a = √(c² − b²).
What are Pythagorean triples?
Integer solutions like 3-4-5, 5-12-13, and 8-15-17.
About this Calculator
Find the hypotenuse or a leg of a right triangle from two known sides. All calculations are performed in your browser for instant results. Formulas are mathematically exact using JavaScript's built-in Math functions.