IR-TST 2022 Problem 8
In triangle , with , is the incenter, is the intersection of -excircle and . Point lies on the external angle bisector of such that and lieas on the same side of the line and . Point lies on such that . Circle is tangent to and at , circle is tangent to and at and both circles pass through the inside of triangle . if is the Midpoint od the arc , which does not contain , prove that lies on the radical axis of and .
Proposed by Amirmahdi Mohseni
Dataset text AI-MO AoPS. Quoted with source.
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