If interior measure means interior angles, their sum is 360 degrees. Also, whether the figure is convex is irrlevant.
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icosikaipentagon or pentacosagon
180(n - 2) where n is the number of sides.
The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. Divide that by the number of sides.
Convex polygon. When the sides are extended, none of them pass through the polygon's interior.
No, a convex polygon cannot have an interior angle sum of 400 degrees. The sum of the interior angles of a convex polygon is always equal to (n-2) * 180 degrees, where n is the number of sides. Since the sum of the interior angles must be greater than 180 degrees for each interior angle, a convex polygon with an interior angle sum of 400 degrees would require at least 9 sides, which would make it a nonagon, not a polygon.