Pythagorean Theorem Definition

The theorem that in a right triangle the hypotenuse squared is equal to the sum of the squares of the other sides (i.e., c2 = a2 + b2)
Webster's New World

(geometry) A mathematical theorem which states that the square of the length of the hypotenuse of a right triangle is equal to the sum of the squares of those of the two other sides.

The Pythagorean theorem only applies to right triangles.
(functional analysis) A generalization of the Pythagorean theorem for Euclidean triangles to Hilbert spaces.

Origin of Pythagorean Theorem

  • Named after Pythagoras, from Ancient Greek Πυθαγόρας (Pythagoras), Greek mathematician and philosopher who by tradition is credited with theorem's discovery and proof.

    From Wiktionary

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