Double Math

# 9 Sided Polygon – Nine Sided Shape

## 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 “.

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There are 9 straight sides and 9 vertices connecting these straight sides in a nonagon. The Sum of all the interior angles of a nine-sided polygon is equal to 1260 degrees.

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

### Types of (Nonagon) 9-Sided Shape

There are two types of nonagon.

• Regular Nonagon
• Irregular Nonagon

#### Regular Nonagon

• It is a two-dimensional shape.
• It has nine vertices.
• Each interior angle is at 140^\circ and the sum of these interior angles is 1260^\circ.
• It’s all straight lines that have equal lengths.
• It has an exterior angle equal to 360 degrees.

#### Irregular Nonagon

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