# Pentagon

Pentagon – a polygon with 5 sides

**Pens **(pentagon) are held by your **five** fingers (five sides).

**Example 1**

A famous Pentagon

The US Department of Defence team building is known as The Pentagon.

**Example 2**

Although made as a spider’s web, there are three pentagons in this shape.

**Example 3**

Regular pentagons have sides that are all the same length, irregular pentagons have two or more sides that are different lengths.

**Example 4**

These are all pentagons but only the purple one in the middle is a regular pentagon, the others are all irregular pentagons.

**Example 5**

Although this shape looks like a rectangle with a corner cut off, it is still a pentagon.

**Example 6**

Pentagons can be convex or concave.