In geometry, a pentadecagon (or pentakaidecagon) is any 15-sided, 15-angled, polygon. A regular pentadecagon has interior angles of 156°, and with a side length a, has an area given by:
A= 15/4 * a²* cot π/15
= (15a²)/8 (√3 + √15+ √2* √(5+√5))
≈ 17.6424 a²
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Pentadecagon, Quindecagon, PentakaidecagonA polygon with fifteen sides can be called a pentadecagon.
The name of a 15 sided polygon is Pentadecagon.
A pentadecagon has 15 sides. (the prefixes pent=5, and deca=10)15
pentadecagon
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