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# Classifying Polygons by the Number of Sides

Polygons are closed shapes or figures in a plane with three or more sides.

Polygons are classified by how many sides they have.

Following lists the different types of polygons and the number of sides that they have:

• A triangle is a three?sided polygon.
• A quadrilateral is a four?sided polygon.
• A pentagon is a five?sided polygon.
• A hexagon is a six?sided polygon.
• A heptagon is a seven?sided polygon.
• An octagon is an eight?sided polygon.
• A nonagon is a nine?sided polygon.
• A decagon is a ten?sided polygon.
Summary
• Polygons are closed shapes or figures in a plane with three or more sides.
• Polygons are classified by how many sides they have.
• Some common polygons are shown in the table given below:

1. Triangle
3 sides

4 sides

3. Pentagon
5 sides

4. Hexagon
6 sides

5. Heptagon
7 sides

6. Octagon
8 sides

7. Nonagon
9 sides

8. Decagon
10 sides