Providing thar it is a regular 15 sided polygon then each interior angle will be 156 degrees
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the interior angle of a 7 sided regular polygon is 128.57 degrees
140 degrees
The interior angles of a 15 sided polygon add up to 2340 degrees and if it is a regular polygon then each interior angle is 156 degrees.
The interior angles of an 11 sided polygon add up to 1620 degrees
Assuming it is an 80 sided REGULAR polygon, each exterior angle is 360/80 degrees = 4.5 degrees. So each interior angle = 180 - 4.5 = 175.5 degrees.