Parallelogram with Squares Theorem. Level: High School, SAT Prep, College geometry.

Thébault's Theorem. Squares of center E, F, G, and H are constructed on the sides AB, BC, CD, and AD of a parallelogram ABCD:



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See also:
Triangle with Squares 0 Two squares
Triangle with Square 1 Two squares
Triangle with Squares 2 Two squares
Triangle with Squares 3 Three squares
Triangle with Squares 4: Finsler-Hadwiger Theorem,
Triangle with Square 5 Two squares, altitude and median
Triangle with Squares 6 Four squares
Van Aubel's theorem: Quadrilateral with squares

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Last updated: November 21, 2008