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MathNet 2026 — Part 06 Question 153

Math Olympiad Vault · MathNet 2026 — Part 06

Question 153

Consider $\triangle ABC$ with $\angle A \gt 90^\circ$ and two points $D$ and $E$ on segment $BC$ so that $\angle BAD = \angle CAE$. If the circumcircles of $\triangle BAD$ and $\triangle CAE$ are tangent to each other prove that $\angle BAE = \angle CAD = 90^\circ$.