MathDB
Interesting Excircles Problem

Source: Tuymadaa Senior P4 2024

July 7, 2024
tuymadaageometryexcirclesmidpoint

Problem Statement

A triangle ABCABC is given. The segment connecting the points where the excircles touch ABAB and ACAC meets the bisector of angle CC at XX. The segment connecting the points where the excircles touch BCBC and ACAC meets the bisector of angle AA at YY. Prove that the midpoint of XYXY is equidistant from AA and CC.