its a pentadecagon i.e, a polygon with 15 sides.
in a regular pentadecagon each angle is of 156 degrees
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ahh 15 gosh you crazy un smart people
A million sided shape shape is called a megagon.
There is no such thing as a 1 sided shape nor a two sided shape.
An octagon is an 8 sided 2 dimensional shape. A cylinder with the base of a hexagon (6 sided shape) would be an 8 sided 3 dimensional shape.
A fifteen sided shape is called a pentadecagon.