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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**

**2. Quadrilateral**

**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**