Maker & Reference
Pythagorean Theorem Calculator
a² + b² = c². Find the hypotenuse, leg, or check if three sides form a right triangle.
Result
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- Formula
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- Perimeter
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- Area
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FAQ
Why call it Pythagorean? +
Greek mathematician Pythagoras (~500 BC) is credited with the proof, though Babylonians knew the relationship 1000 years earlier.
Common right triangles? +
3-4-5 (and multiples 6-8-10, 9-12-15). 5-12-13. 8-15-17. Carpenters use 3-4-5 to square corners.