An interior angle of a 31-gon can have any value in the range (0, 360) degrees - excluding 180 degrees. The only limitation is that the sum of the interior angles is 5220 degrees.
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No, the interior angles of a triangle measure 180° altogether.
Each interior angle will measure 162 degrees
The interior angles measure 360 degrees.
Each interior angle will measure 156 degrees
If interior measure means interior angles, their sum is 360 degrees. Also, whether the figure is convex is irrlevant.