The formula for calculating the TOTAL of the interior angles of an n-sided polygon is:
Angle Sum = 180 (n-2) degrees
*For a regular convex polygon, each of the identical interior angles will be 180(n-2)/n
This will also be 180 - (360/n), supplementary to the exterior angle.
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If all of its interior angles are equal then it is a regular polygon
Only when it is a regular polygon that all interior angles are of equal measure
Only if the polygon is "regular".
A 10 sided polygon which is a decagon and its interior angles add up to 1440 degrees.
Sum of interior angles of a polygon = (2n - 4)right angles 1260 = (2n - 4) x 90 1260 = 180n - 360 900 = 180n n = 5, it is a pentagon