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MathNet 2026 — Part 04 Question 29

Math Olympiad Vault · MathNet 2026 — Part 04

Question 29

Let $ABC$ be an isosceles triangle in $A$, $\Gamma$ is a tangent circle to $(AC)$ in $C$ on the outside of the Triangle $ABC$. We note $\omega$ the circle passing through $A$ and $B$ and tangent internally to $\Gamma$ in $D$. $E$ is the second intersection of $(AD)$ and $\Gamma$, show that $(BE)$ is tangent to $\Gamma$. Question illustration