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Rectilinear Figure
A plane figure bounded by straight lines is called a rectilinear figure.Polygon
A closed rectilinear figure having three or more sides is called a polygon.
Types of polygon
Concave Polygon
If at least one angle of a polygon is greater than 180o, then it is called a concave polygon.
Interior ÐDCB is greater than 180o.

Convex Polygon
If every angle of a polygon is less than 180o, then it is called a convex polygon.

Regular Polygon
It has all the angles and all the sides equal. In the figure, ÐA = ÐB = ÐC = ÐD = ÐE, and AB = BC = CD = DE = EA.
Name of Polygons with reference to the number of sides:

A diagonal of a polygon is a line joining any two non-adjacent vertices.

