Rectilinear Figures


   
 
Introduction
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:
 
      
 
 
Triangles and quadrilaterals are also polygons with three sides and four sides respectively.
 
A diagonal of a polygon is a line joining any two non-adjacent vertices.
 
 
     
   
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