Pythagorean Theorem Calculator

Calculate any side of a right triangle using the Pythagorean theorem: a² + b² = c². Enter two sides to find the third.

Triangle Sides

Enter the known sides of the right triangle

Solve For

Side a

Side b

Results

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Frequently Asked Questions

What is the Pythagorean theorem?

The Pythagorean theorem states that in a right triangle, the square of the hypotenuse (the side opposite the right angle) equals the sum of the squares of the other two sides: a² + b² = c².

What is the hypotenuse?

The hypotenuse is the longest side of a right triangle, located opposite the 90-degree angle. It is always longer than either of the other two sides.

What are Pythagorean triples?

Pythagorean triples are sets of three positive integers that satisfy the theorem. Common examples include (3, 4, 5), (5, 12, 13), (8, 15, 17), and (7, 24, 25).