Examine whether the following are polygons. If anyone among them is not, say why?

(a) No, it is not a polygon as it’s not a closed figure.

(b) Yes, it is a polygon as it is made of 6 line segments.

(c) No, it is not a polygon. It’s a circle and it is not made of any line segments.

(d) No, it’s not a polygon as it is not only made of line segments.