cyclic quadr. by projections of point og circumcircle of trapezoid on sides
Source: 2004 Oral Moscow Geometry Olympiad grade 10 p5
October 28, 2020
geometrycyclic quadrilateraltrapezoid
Problem Statement
Trapezoid with bases and is inscribed in a circle. Prove that the quadrilateral formed by orthogonal projections of any point of this circle onto lines and is inscribed.