Question

what is the angle sum of a polygon with 18 sides

Answer 1

So we have 180°*n=Sa+360°, or Sa=180°*(n-2). This theorem holds for concave polygons also but the proof is more difficult. The sum of the measures of the interior angle of any polygon is the number of sides minus 2 multiplied by 180. A polygon with 18 sides has an interior angle sum of 2880 degrees.

Answer 2

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