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perp. diagonals in a quad

Source: Polish MO Finals 1976 p4

August 23, 2024
geometryperpendicular

Problem Statement

The diagonals of some quadrilateral with sides a,b,c,da,b,c,d are perpendicular. Prove that the diagonals of any other quadrilateral with sides a,b,c,da,b,c,d also are perpendicular
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