Different Types of Polygons
A polygon is a plane figure that is made by joining the line segments, where each line segment meets exactly two other line segments. The intersection point of two line segments is called the vertex of the polygon.
Observe the following figures:
Here, (i), (iii), and (v) are polygons, but (ii), (iv), and (vi) are not polygons because (ii) is not closed, in (iv) sides of a figure intersect each other at three places, and (vi) is not made of line segments.
Polygons are of two types:
(i) Regular polygon
(ii) Irregular polygon
Regular and irregular polygon
If all the sides and angles of a polygon are equal, then the polygon is called a regular polygon, otherwise it is called an irregular polygon. Equilateral triangle and square are examples of regular polygon because in equilateral triangle and square, all the sides and all the angles are equal. A triangle in which all the sides are different is called an irregular polygon. Scalene triangle, isosceles triangle, rectangle, etc. are irregular polygons.