Question

A pentagon with one interior angle that measures 210 is a __________ polygon.

A. concave B. convex C. regular D. none of the above

Answer 1

The question ask to complete and give the necessary word or phrase that could support and complete the said passage about an interior angle of a pentagon that measures 210 degree and base on my research, I would say that its a concave polygon. I hope this would help 

Answer 2

A. concave

The angle of 210 degrees, being over 180 degrees, automatically makes the pentagon concave.