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locus of midpoints of segments, circumcircle related

Source: Sharygin Final 2007 9.4

April 30, 2019
geometrycircumcircleLocusLocus problemsmidpoints

Problem Statement

Given a triangle ABCABC. An arbitrary point PP is chosen on the circumcircle of triangle ABHABH (HH is the orthocenter of triangle ABCABC). Lines APAP and BPBP meet the opposite sidelines of the triangle at points AA' and BB', respectively. Determine the locus of midpoints of segments ABA'B'.