**What is a nine-sided shape?**

With nine straight sides that meet at nine corners make a polygon that is called a Nonagon. Nonagon is a 2D nine-sided shape that belongs to the family. The word “nonagon ” comes from the Latin word “nona “, meaning nine, and “gon “, meaning sides. So it literally means “nine-sided shape “.

In Greek, a nonagon is called an enneagon, which means “nine corners”.

**Types of Nonagon**

There are two types of a nonagon.

**Regular Nonagon****Irregular Nonagon**

**Properties** **Regular Nonagon**

- It is a two-dimensional shape.
- It has nine vertices.
- Each interior angle is at 140 and sum of these interior angles is 1260.
- It’s all straight lines have equal length.
- It has an exterior angle equal to 360.

**Properties of Irregular Nonagon**

- The sum of all of its interior angles is 1260o
- Angles at varying degrees.
- It is a nine-sided, two-dimensional shape
- Additionally, it has straight lines
- Sides are not equal in length