tclear8587 tclear8587

27-12-2022
Mathematics

Answered

given the nine-sided regular polygon $a 1a 2a 3a 4a 5a 6a 7a 8a 9$, how many distinct equilateral triangles in the plane of the polygon have at least two vertices in the set $\{a 1, a 2, \dots, a 9\}$?

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