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max n, convex n-gon with equal diagonals 1987 Greece MO Grade X p1

Source:

September 6, 2024
geometrycombinatorial geometryconvex polygon

Problem Statement

It is known that diagonals of a square, as well as a regular pentagon, are all equal. Find the bigeest natural nn such that a convex nn-gon has all it's diagonals equal.