Definition of Polygon

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Introduction to polygon:

Definition of Polygon can be explained in this way. A polygon is a closed plane figure formed by three or more sides. It has equal number of sides and vertices. Word Polygon is basically from Latin - Greek polugōnon means figure with many angles. In simple words, a closed two dimensional figure having three or more straight sides is a polygon. Exactly two sides meet at every vertex.

In simple term we can say as A simple closed figure bounded by three or more line segments is called a polygon. The line segments forming the polygon are called its sides. Polygons are named according to the number of sides they possess.

Adjacent sides of a polygon:

If two sides of a polygon have a common end point, then these sides are called the adjacent sides of the polygon

Number of triangles contained in a polygon:

A polygon of n sides can be divided into (n – 2) triangles.

Thus a polygon of 5 sides contains (5-2) = 3 triangles.

Angles of a polygon:

Consider a polygon ABCDE, when one of its side CD is extended, two angles are formed, one inside the polygon and another outside the polygon.

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