decagon, dodecagon, polygon,
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It means a corner, or a plane angle.
Pentadecagon actually, no, it is called a fifteen-gon, or fifteen-a-gon. anything more than 12(dodecagon) the name of the polygon is just the number of sides, and "gon" at the end.
3n. n for the n-gon at each end, making 2n; and n along the length.
Th esum is 3,600 degrees. 3,240 of them are inside the 20-gon, and the other 360 are outside.
For easier use, mathematicians usually use the number of sides and add -gon to the end of it. In other words, a 175-sided figure would be called a 175-gon for casual use.When using traditional Greek terminology (such as hexagonfor a six-sided figure), a 175-sided figure would be called a hectakaiheptacontapentagon.