reflections of intersection wrt sides ABCD are concyclic
Source: Czech and Slovak Match 1995 P5
October 1, 2017
convex quadrilateraldiagonalsreflectionConcyclicorthogonalgeometry
Problem Statement
The diagonals of a convex quadrilateral are orthogonal and intersect at point . Prove that the reflections of in the sides of quadrilateral lie on a circle.