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angle chasing in 2 convex quadrangles

Source: 2007 Sharygin Geometry Olympiad Correspondence Round P9

April 26, 2019
geometryAngle Chasingconvex quadrilateralAngle Chase

Problem Statement

Suppose two convex quadrangles are such that the sides of each of them lie on the perpendicular bisectors of the sides of the other one. Determine their angles,