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concurrency wanted, circumcenter related

Source: Mathematics Regional Olympiad of Mexico Center Zone 2007 P2

November 8, 2021
geometryconcurrencyconcurrent

Problem Statement

Consider the triangle ABCABC with circumcenter OO. Let DD be the intersection of the angle bisector of ∠A\angle{A} with BCBC. Show that OAOA, the perpendicular bisector of ADAD and the perpendicular to BCBC passing through DD are concurrent.
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