As the name suggests, a nonagon has 9 sides, as Nona means nine pages and Gon. As mentioned above, the measurement for each internal angle of a regular nonagon is 140° and the measurement for the central angle is 40° when divided into triangles, as shown in the diagram above. Also, the sum of all external angles is 360 degrees. Here are AB, BC, CD, DE, EF, FG, GH, HI and AI the 9 sides of the nonagon above. A 9-sided figure is called a nonagon in geometry. It is also called Enneagon or 9-Gon. Some of the important properties of regular nonagon are listed below. A nonagon in which all sides are congruent and at the same angle is called a regular nonagon. The shape of a regular nonagon is given below. Here, a 3-sided polygon is a triangle, a 4-sided polygon is a quadrilateral, a 5-sided polygon is a pentagon, a 6-sided polygon is a hexagon, a 7-sided polygon is a heptagon, an 8-sided polygon is an octagon, a 9-sided polygon is called a nonagon and a 10-sided polygon is the decagon.

In geometry, a nonagon is a regular nine-sided polygon. The name “nonagon” is a hybrid prefix formation, from Latin, which is used equivalently and is attested already in the 16th century in French nonogone and English from the 17th century. The name “Enneagon” comes from the Greek enneagonon and is probably more correct, although a little rarer. A regular nonagon has internal angles of 140°. The area of a regular nonagon of length of side a is given by In geometry, one can encounter different types of polygons, as shown in the following figure. All these polygons have different properties depending on the number of sides and angles they have. A nonagon is a nine-sided polygon and is also known as an enneagon or 9-gon. In other words, a nonagon is a closed two-dimensional figure with nine sides. The figure above shows the shape of a 9-sided nonagon. A nonagon in which all sides are not equal and all angles are not equal.

However, the sum of all internal angles is still 1260°, even though it has irregular sides and unequal angles. Some of the irregular forms of nonagon are given below. A nonagon contains 9 even sides and 9 vertices connecting these sides. The sum of all the internal angles of a nonagon is equal to 1260 degrees. Nonagones can be divided into regular and irregular nonagones. The number of diagonals of a nonagon is equal to 27. These diagonals can be observed from the following diagram. In geometry, a hendecagon (also undecagon or Endécagon) or 11-gon is an eleven-sided polygon. The sum of all internal angles of a hendecagon is 1620 degrees. A 7-sided shape is called heptagon.

The sum of the inner angles of a simple heptagon is 900°. A figure or polygon with nine sides and nine angles A polygon with 13 sides, sometimes called triskaidecagon. The sum of all the internal angles of a triskaidecagon is 1980 degrees. non′a-gon, n. (mathematics) A flat figure with nine sides and nine angles. [L. novem, nine, nonus, ninth, gōnia, angle.] Join our community to access the latest language learning tips and assessment from Oxford University Press!. Latin nonus nenine + english -gon â plus at noon Find out which words interact and create more natural English with the Oxford Collocations Dictionary app. Find answers online with Practical English Usage, your go-to guide to problems.