The given nonagon ABCDEFGHI has actually 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.

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The blue heat segments AC and also BD room its diagonals.

There are total of 27 diagonals in a nonagon as presented below:

**Angles the a nonagon:**

A nonagon consists of 9 angles. The sum of angles of a nonagon is 1260°.

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

**Non-examples**

The complying with shapes room not nonagons. Let us see why?

There are more than 9 political parties in this figure. So, that is no a nonagon. | |

There space 8 sides in this figure. So, the is not a nonagon. |

**Regular nonagon**

A nonagon in which every sides are equal and also all angles are equal is a regular nonagon.

Each edge of a consistent nonagon is that 140°.

**Irregular nonagon**

A nonagon in which all sides are not equal and also all angles are not equal. The measure of the angles room different yet total sum of every its interior angles is always 1260°.

A nonagon is likewise called enneagon, which is derived from a Greek word referred to as enneagonon, which means nine corners. The an initial use of words nonagon dates back to the beforehand 17th century, and has a Latin prefix (nona) and a Greek suffix (gon), making the a polygon v nine sides and also nine angles. |