Question

which shape is a polygon? a b c d

Explanation:

A polygon is a closed - figure made up of straight line segments. A circle (A) and a semi - circle (B) have curved sides, so they are not polygons. The figure in C is not a closed figure. The trapezoid in D is a closed figure made up of straight line segments, so it is a polygon.

Answer:

D. A trapezoid (the blue - shaded shape in option D)