Pythagorean theorem

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A geometrical proof of the Pythagorean theorem.

Alternative forms[edit]


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

Proper noun[edit]

Pythagorean theorem

  1. (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.
  2. (functional analysis) A generalization of the Pythagorean theorem for Euclidean triangles to Hilbert spaces