The given nonagon ABCDEFGHI has sides AB, BC, CD, DE, EF, FG, GH, HI, and also IA and angles ∠A, ∠B, ∠C, ∠D, ∠E, ∠F, ∠G, ∠H, and also ∠I.

You are watching: How many sides does a nonagon

The blue line segments AC and BD space its diagonals.

There are full of 27 diagonals in a nonagon as displayed below:

**Angles of a nonagon:**

A nonagon is composed of 9 angles. The amount of angle of a nonagon is 1260°.

A nonagon has 9 exterior angles. The sum of angles of the exterior angles of a nonagon is 360°.

**Non-examples**

The adhering to shapes space not nonagons. Let us see why?

There are an ext than 9 sides in this figure. So, that is not a nonagon. | |

There are 8 political parties in this figure. So, that is not a nonagon. |

**Regular nonagon**

A nonagon in which all sides are equal and all angles are equal is a constant nonagon.

Each edge of a regular nonagon is of 140°.

**Irregular nonagon**

A nonagon in which every sides room not equal and also all angles room not equal. The measure of the angles are different however total amount of every its internal angles is constantly 1260°.

A nonagon is also called enneagon, i beg your pardon is obtained from a Greek word referred to as enneagonon, which method nine corners. The first use of the word nonagon dates earlier to the at an early stage 17th century, and also has a Latin prefix (nona) and also a Greek suffix (gon), making the a polygon through nine sides and nine angles. |