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Pythagorean Theorem Calculator – Finds a right triangle's missing side length fr...

The Pythagorean Theorem Calculator finds a right triangle's missing side length from the other two sides. This Pythagorean Theorem Calculator applies the standard mathematical formula for this calculation, returning an exact result with the steps shown. Use it for homework verification, quick calculations, or understanding how the formula works.

The formula behind this calculator: A² + b² = c², where c is the hypotenuse. As a practical example: Legs of 3 and 4 give a hypotenuse of exactly 5. All results are calculated instantly in your browser — no data is stored or transmitted.

Pythagorean Theorem Calculator FAQ

What does the Pythagorean Theorem Calculator calculate?

Finds a right triangle's missing side length from the other two sides.

Can I copy the result to use elsewhere?

Yes — click or tap the result to select it, then copy with Ctrl+C (or long-press on mobile).

Can I enter negative numbers?

Yes, where mathematically valid for that calculation. For example, distance formulas require positive values; algebra calculations accept negatives freely.

Is my data sent to a server?

No — calculations run directly in your browser. Your inputs are not stored or transmitted.