The answer will depend on the sum of what. The lengths of sides, the interior angles, the exterior angles, the lengths of diagonals, etc. Since you have not bothered to provide that information, I cannot provide a sensible answer.
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The interior angles of an 11 sided polygon add up to 1620 degrees
360 degrees
The sum of the interior angles of a n-sided polygon is (n-2)*180 degrees. So for 13 sides, the sum is 11*180 = 1980 degrees.
(11-2)*180 = 1620 degrees
the 11 sided polygon is undecagon