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Pythagorean Theorem

Calculate the hypotenuse of any right triangle. Free, instant, no sign-up required.

๐Ÿ“– Read the complete Pythagorean Theorem guide โ†’

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Hypotenuse C

Formula

c = โˆš(aยฒ + bยฒ)

Example

a=3, b=4 โ†’ c = โˆš25 = 5 (the classic 3-4-5 triangle)

Frequently Asked Questions

What is a right triangle?

A triangle with one 90-degree angle.

Can I find a or b if I know c?

Yes: a = โˆš(cยฒ โˆ’ bยฒ). Rearrange the formula.

Are Pythagorean triples common?

Yes โ€” 3-4-5, 5-12-13, 8-15-17 are common integer examples.

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