Providing that it is a regular 18 sided polygon each interior angle measures 160 degrees.
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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.
Providing thar it is a regular 15 sided polygon then each interior angle will be 156 degrees
If it is a regular polygon and each interior angle is 176 degrees then it will have 90 sides.
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.
Each interior angle measures 140 degrees