2019 OIM Problems/Problem 4
Problem
Let be a trapezoid with and inscribed in the circle . Let and be two points on the segment ( are in that order and are different) such that . Let and be the second points of intersection of the lines and with , respectively. The lines and intersect at . Prove that the line is tangent to .
~translated into English by Tomas Diaz. ~orders@tomasdiaz.com
Solution
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