Geometry Problem 1472: Cyclic Quadrilateral, Perpendicular Diagonals, Rectangle, Step-by-step Illustration
The figure below shows a cyclic quadrilateral ABCD with perpendicular diagonals at P. Lines H1PE3, H2PE4, H3PE1 , and H4PE2 are perpendicular to AB, BC, CD, and AD, respectively. Prove that the quadrilateral E1E2E3E4 is a rectangle.
Static Diagram of Geometry Problem1472
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Cyclic Quadrilateral with Perpendicular Diagonals
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