Polygon
Polygon is a closed figure with line segments.
Names of polygons
3 sided polygon : Triangle
4 sided polygon : Quadrilateral
5 sided polygon : Pentagon
6 sided polygon : Hexagon
7 sided polygon : Heptagon
8 sided polygon : Octagon
9 sided polygon : Nonagon
10 sided polygon : Decagon
Main points to remember
The sum of interior angles of a polygon is ( n - 2 ) 180.
The sum of the exterior angles of any polygon is 360.
The No. of sides of a regular polygon = Sum of exterior angles/one exterior angle = 360/one exterior angle.
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