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ABC isosceles obtuse, find ACD

Source: Sharygin Finals 2023 8.1

August 2, 2023
geometrySharygin Geometry OlympiadSharygin 2023

Problem Statement

Let ABCABC be an isosceles obtuse-angled triangle, and DD be a point on its base ABAB such that ADAD equals to the circumradius of triangle BCDBCD. Find the value of ∠ACD\angle ACD.
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