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Names of Polygons

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POYGONS- Named by how many sides they have


 

3 sides- Triangle                     

4 sides- Quadrilateral

5 sides- Pentagon

6 sides- Hexagon

7 sides- Heptagon 

8 sides- Octagaon 

9 sides- Nonagon 

10 sides- Decagon

 

 

 

 

 

 

Triangle

A three-sided polygon. The sum of the angles of a triangle is 180 degrees.

Examples:


 

Equilateral Triangle or Equiangular Triangle

A triangle having all three sides of equal length. The angles of an equilateral triangle all measure 60 degrees.

Examples:

 

 

 


 

Quadrilateral

A four-sided polygon. The sum of the angles of a quadrilateral is 360 degrees.

Examples:


 

Pentagon

A five-sided polygon. The sum of the angles of a pentagon is 540 degrees.

Examples:

A regular pentagon:

An irregular pentagon:


Hexagon

A six-sided polygon. The sum of the angles of a hexagon is 720 degrees.

Examples:

A regular hexagon:

An irregular hexagon:


 

 

 

Heptagon

A seven-sided polygon. The sum of the angles of a heptagon is 900 degrees.

Examples:

A regular heptagon:

An irregular heptagon:


Octagon

An eight-sided polygon. The sum of the angles of an octagon is 1080 degrees.

Examples:

A regular octagon:

An irregular octagon:


 

 

 

Nonagon

A nine-sided polygon. The sum of the angles of a nonagon is 1260 degrees.

Examples:

A regular nonagon:

An irregular nonagon:


Decagon

A ten-sided polygon. The sum of the angles of a decagon is 1440 degrees.

Examples:

A regular decagon  

Undecagon

An eleven-sided polygon.


Dodecagon

A tweleve-sided polygon

 

An irregular decagon: