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maximum diameter less than medial line

Source: Sharygin 2023 - P3 (Grade-8)

March 4, 2023
geometrytrapezoidSharygin Geometry OlympiadSharygin 2023

Problem Statement

A circle touches the lateral sides of a trapezoid ABCDABCD at points BB and CC, and its center lies on ADAD. Prove that the diameter of the circle is less than the medial line of the trapezoid.