The answer is not listed. To find the perimeter, you must to L+L+W+W. That would be 12+12+8+8= 40. But 40 is not listed in the option. Ask your teacher. Tell the teacher that answer is not listed.
Find the measure of the interior angles of the following regular polygons: a triangle, a quadrilateral, a pentagon, an octagon, a decagon, a 30-gon, a 50-gon, and a 100-gon.