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MathNet 2007-part-02 — 187 problems (EN–VI) Question 164

Math Olympiad Vault · MathNet 2007-part-02 — 187 problems (EN–VI)

Question 164

Let $D$ be a point on the side $AC$ of triangle $ABC$ in which $AB \lt BC$, such that $AB = BD$. The circle inscribed in $\triangle ABC$ touches $AB$ at $K$ and $AC$ at $L$, and $J$ is the incenter of triangle $BCD$. Prove that $KL$ bisects the segment $AJ$.