It will have 21 sides or a 21-gon
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The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. 3420 degrees
(n-2)*180 3420 degrees
The sum is 3420 as the equation for every regular polygon is (n-2)*180 when n is number of sides
.3430 .3420 .3410
By using the formula: (n-2)*180 = sum of degrees in a polygon whereas 'n' is the number of sides of the polygon