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MathNet 2025-part-02 — 186 problems (EN–VI) Question 58

Math Olympiad Vault · MathNet 2025-part-02 — 186 problems (EN–VI)

Question 58

Let $ABC$ be an isosceles triangle with $\angle BAC = 100^\circ$. The angle bisector of $\angle ABC$ intersects $AC$ at $D$. The line perpendicular to $AC$ at $A$ intersects $BD$ at $M$. Point $E$ is on side $BC$ such that $AE = AM$ and $BE \lt CE$.

a) Show that $CA = CE$.

b) Find the measure of angle $\angle AEM$.