Given here are some figures.
Classify each of them on the basis of the following.
(a) Simple curve
(b) Simple closed curve
(d) Convex polygon
(e) Concave polygon
Solution: (a) Simple curves are: (1), (2), (5), (6) and (7).
(b) Simple closed curves are: (1), (2), (5), (6) and (7).
(c) Polygons are: (1), (2) and (4).
(d) Convex polygon is: (2).
(e) Convex polygons are (1) and (4).
A square has sides of equal length and angels of equal measure, so it is a __________ polygon.