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MathNet 1969 — Part 01 Question 1

Math Olympiad Vault · MathNet 1969 — Part 01

Question 1

Given $n$ points in space such that the triangle formed from any three of the points has an angle greater than $120$ degrees. Prove that the points can be labeled $1, 2, 3, \ldots, n$ so that the angle defined by $i$, $i+1$, $i+2$ is greater than $120$ degrees for $i = 1, 2, \ldots, n-2$.