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Heptad, Heptarchy, Heptapod, Heptathlon, Heptagonal, Heptameter. Sorry, but I don't have any words with septa in it.
Greek meaning seven sidesStrictly speaking, it comes from the Greek prefix hepta- = seven and the Greek suffix -gon = corner (or vertex), not side.
583 Degrees are in a 20-Gon
584 sides on a 100-Gon
There are 48 triangles in a 50-gon polygon