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 Pythagorean Theorem:  A theorem that states that in a right triangle, the square of the length of the hypotenuse equals the sum of the squares of the lengths of the legs.

Harcourt's Interactive Math Glossary: Read another definition of the Pythagorean Theorem.

Pythagorean Theorem at Math.com: See a lesson about the Pythagorean Theorem, and test yourself with the included questions.

Pythagorean Theorem at Cape Canaveral: Read about Pythagoras and see an animated explanation of the theorem.