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MathNet 2026 — Part 06 Question 29

Math Olympiad Vault · MathNet 2026 — Part 06

Question 29

A trapezium $ABCD$, in which $AB$ is parallel to $DC$, is inscribed in a circle of radius $R$ and centre $O$. The non-parallel sides $DA$ and $CB$ are extended to meet at $P$ while diagonals $AC$ and $BD$ intersect at $E$.
Prove that $|OE| \cdot |OP| = R^2$.