A polygon is convex if, for every pair of points, P and Q belonging to the polygon, the line segment PQ lies completely inside or on the polygon. Which one of the following is NOT a convex polygon? admin GATE CSIT 2021 (A) (B) (C) (D) Answer: (A) Solution: In image (A) the angle Ө is more than 180 degree , so it is not a convex polygon.