# Nonagon

Nonagon – a polygon with 9 sides

NoNagon

NiNe of them

**Nine of them** sounds like **nonagon** so makes this easy to remember.

If **none are gone** (nonagon) then a cat has **nine** lives.

**Example 1**

A regular nonagon has nine sides of equal length.

**Example 2**

If you add up all the internal angles of a regular convex nonagon you will get 1260°.

**Example 3**

A regular convex nonagon has an internal angle of 140° between each side.

**Example 4**

This shape looks like a Y but as it has 9 sides, it’s a nonagon.

**Example 5**

Irregular nonagons such as this one may not have a symmetrical shape but will still have nine sides.