The name of a 16 sided polygon is Hexadecagon.
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(16-2)*180 = 2520 degrees
The name of a 21 sided polygon is Icosihenagon.
The sum of the interior angles of a four-sided polygon is 360 degrees.
The sum of the exterior angles of any n-sided regular polygon, including a seven-sided polygon, is 360 degrees.
The name of a 16 sided polygon is Hexadecagon.