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IMO 2006 — Complete Shortlist Question 16

IMO Shortlist · IMO 2006 — Complete Shortlist

Question 16

Let $ABCDE$ be a convex pentagon such that

$$\angle BAC=\angle CAD=\angle DAE\quad\text{and}\quad\angle ABC=\angle ACD=\angle ADE.$$

The diagonals $BD$ and $CE$ meet at $P$. Prove that the line $AP$ bisects the side $CD$.