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MathNet 2023-part-07 — 187 problems (EN–VI) Question 39

Math Olympiad Vault · MathNet 2023-part-07 — 187 problems (EN–VI)

Question 39

Point $I$ is the incenter of triangle $ABC$, where $AB \lt AC$. On the external angle bisector of angle $ABC$, a point $X$ is chosen such that $IC = IX$. Let the tangent to the circumcircle of triangle $BXC$ at point $X$ intersect line $AB$ at point $Y$. Prove that $AC = AY$.

Question illustration