ahh 15 gosh you crazy un smart people
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There are 90 diagonals in a 15-sided polygon.
its a pentadecagon i.e, a polygon with 15 sides. in a regular pentadecagon each angle is of 156 degrees
12
15
A prism with an n-sided base will have 2n vertices, n + 2 faces, and 3n edges. 15 edges