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Calculators
Pythagorean Theorem Calculator
Calculate any side of a right triangle from the other two. Enter two sides and get the third with the formula a² + b² = c².
Fill in two fields to calculate the third.
The Theorem
In every right triangle, the square of the hypotenuse c equals the sum of the squares of the legs a and b: a² + b² = c². The legs are the sides that form the right angle; the hypotenuse is the side opposite the right angle (always the longest).
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