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Pythagorean Theorem Calculator
Find the missing side of a right triangle.
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Missing Side
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How to use the Pythagorean Theorem Calculator
a² + b² = c². Find the hypotenuse from two legs, or a leg from hypotenuse + leg.
Frequently Asked Questions
Integer sets like 3-4-5 and 5-12-13 that satisfy the theorem exactly — known since Babylonian times.