📐 Geometry

Pythagorean Theorem Calculator

Find any side of a right triangle. Enter two known sides - the third is calculated instantly using a² + b² = c².

a b c (hypotenuse)
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Enter any two sides

Leave one field blank - it will be calculated automatically.

Common Pythagorean Triples

abc
345
51213
81517
72425
6810

Formula

a² + b² = c²

Where c is always the hypotenuse (longest side, opposite the right angle). This theorem applies only to right-angled triangles.