A 10 sided decagon has interior angles that add up to 1440 degrees
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The sum of the interior angles of a polygon with n sides is 180*(n-2) degrees.
The polygon would have 10 sides.
(number of sides -2)*180 = sum of interior angles
24 sides
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.