What is the name of the polygon if the sum of the measures of its interior angles is 1080°?

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.

Aquadrilateral has exactly one pair of parallel sides. which name best describes the figure?

To decrease an amount by 16% what single multiplier would you use