Question

the numbers of sides of polygon is12.Find the measure of sum of each interior angle of the polygon​

Answer 1

If each interior angle is 12 degrees, it cannot form a regular polygon.

The lowest order polygon is 3, where the interior angle is 60. The exterior (or change in) angle is 120, and the sum of change must equal 360.

May be you mean 168 degrees (180 - 12)?

In that case the answer is 30, since the cumulative change in angle must be 360.