First off do
X-2
then (X-2) x 180. There is your answer
For example,
15-2 = 13
13 x 180 = 2340.
so a 15 sided polygon has an angle sum of 2340.
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2340 degrees
The sum of the interior angles of a 15-gon add up to 2340 degrees
Providing thar it is a regular 15 sided polygon then each interior angle will be 156 degrees
Providing that it is a regular 15 sided polygon then each interior angle will be 156 degrees
Sum of exterior angles = 360 deg Number of exterior angles = 360/24 = 15 So it is a 15-sided polygon