a quadrilateral
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The formula for the sum of the interior angles of a shape with n sides is: 180 * (n - 2) So, for a 31 sided shape, the sum of the interior angles is 180 * 29 = 5,220.
The formula to find the sum of the angles of any shape is: (sideCount-2)*180 If the shape has 11 sides the total interior angle is: 1620.
Alternate Interior Angles
If the shape is flat is is called a: dodecagon If it is a 3 dimensional object it is called a dodecahedron
4 sides and 4 interior angles