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MathNet 2024-part-05 — 168 problems (EN–VI) Question 91

Math Olympiad Vault · MathNet 2024-part-05 — 168 problems (EN–VI)

Question 91

For the quadrilateral $ABCD$, let $AC$ and $BD$ intersect at $E$, $AB$ and $CD$ intersect at $F$, and $AD$ and $BC$ intersect at $G$. Additionally, let $W, X, Y$, and $Z$ be the points of symmetry to $E$ with respect to $AB, BC, CD$, and $DA$ respectively. Prove that one of the intersection points of $\odot(FWY)$ and $\odot(GXZ)$ lies on the line $FG$.