MathDB
Chisinau MO p146 1977 IX convex polygon iff property

Source:

March 17, 2021
convexpolygonconvex polygonnon-convexgeometry

Problem Statement

Prove that nn (≥4\ge 4) points of the plane are vertices of a convex nn-gon if and only if any 44 of them are vertices of a convex quadrilateral.
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