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MathNet 2019-part-05 — 184 problems (EN–VI) Question 98

Math Olympiad Vault · MathNet 2019-part-05 — 184 problems (EN–VI)

Question 98

The midpoints of the sides $AB$, $BC$, $CD$, $DA$ of the convex quadrilateral $ABCD$ are $E$, $F$, $G$, respectively $H$.

a) Prove that there exists an unique point $O$ inside the quadrilateral so that the areas of the quadrilaterals $AEOH$, $BFOE$, $CGOF$, $DHOG$ are equal.

b) Locate $O$.