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

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The blue heat segments AC and BD space its diagonals.

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

**Angles of a nonagon:**

A nonagon is composed 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 following shapes room not nonagons. Let united state see why?

There are much more than 9 political parties in this figure. So, that is not a nonagon. | |

There are 8 political parties in this figure. So, that is no a nonagon. |

**Regular nonagon**

A nonagon in which all sides space equal and all angles space equal is a consistent nonagon.

Each angle of a regular nonagon is that 140°.

**Irregular nonagon**

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

A nonagon is additionally called enneagon, which is obtained from a Greek word called enneagonon, which way nine corners. The first 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 nine angles. |