The given 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 line segments AC and BD room its diagonals.

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

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Angles that a nonagon:

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

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

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Non-examples

The following shapes room not nonagons. Let us see why?

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There are much more than 9 political parties in this figure. So, that is no a nonagon.
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There room 8 political parties in this figure. So, it is no a nonagon.

Regular nonagon

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

Each angle of a continual nonagon is that 140°.

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Irregular nonagon

A nonagon in which all sides space not equal and all angles room not equal. The measure of its angles room different but total sum of all its interior angles is always 1260°.

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Fun facts around nonagons

A nonagon is also called enneagon, i beg your pardon is acquired from a Greek word dubbed enneagonon, which way nine corners.

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The first use of the word nonagon dates ago to the at an early stage 17th century, and also has a Latin prefix (nona) and also a Greek suffix (gon), making it a polygon v nine sides and also nine angles.