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Types of Polygons

A polygon is a closed shape formed by straight lines that only intersect at the ends. The straight lines form the sides of the polygon.

 

 

The following are examples of polygons:


The following figures are not polygons:

 

 

A regular polygon is a polygon with equal sides and equal angles.

regular pentagon
Regular polygon

 

Some polygons have special names, depending on the number of sides they have.

Number of sides

Name of polygon

3

Triangle

4

Quadrilateral

5

Pentagon

6

Hexagon

7

Heptagon

8

Octagon

9

Nonagon

10

Decagon

 

 

The following video gives some examples of classifying polygons.

 

 

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Useful Links:
MathWorld - Polygons
 

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