The provided 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 line segments AC and also BD space its diagonals.

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

**Angles the a nonagon:**

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

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

**Non-examples**

The adhering to shapes are not nonagons. Let united state 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, it is no a nonagon. |

**Regular nonagon**

A nonagon in which all sides room equal and also all angles space equal is a continuous nonagon.

Each angle of a constant nonagon is of 140°.

**Irregular nonagon**

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

A nonagon is additionally called enneagon, i m sorry is obtained from a Greek word referred to as enneagonon, which means 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 a Greek suffix (gon), making that a polygon v nine sides and nine angles. |