In geometry, a decagon is a ten-sided polygon or 10-gon. The total sum of the interior angles of a simple decagon is 1440°. A self-intersecting regular decagon is known as a decagram.

What is the word decagon mean?

: a plane polygon of 10 angles and 10 sides.

What does decagon mean in Latin?

decagon (n.)

"plane figure having ten sides and angles," 1630s, from Modern Latin decagonum, from Greek dekagonon, from deka "ten" (from PIE root *dekm- "ten") + gōnia "corner, angle" (from PIE root *genu- (1) "knee; angle").

How did decagon get its name?

The word decagon comes from Greek roots, deka, or "ten," and gōnia, "angle or corner." Any ten-sided shape can be called a decagon, whether it's a street sign or the doodle you draw in your notebook during math class.

What is a decagon in math?

A decagon is a ten-sided polygon. ... In particular, a decagon with vertices equally spaced around a circle and with all sides the same length is a regular polygon known as a regular decagon.

What does decagon mean?

What is the side of decagon?

A decagon can be defined as a polygon having ten sides, ten interior angles and ten vertices.

How many triangles make up a decagon?

There are 8 triangles in a decagon.

How does decagon look like?

A decagon is a 10-sided polygon. It also has ten vertices - which is where the sides meet - and angles. A regular decagon has congruent sides and angles. ... An irregular decagon has sides and angles that are not all congruent.

What is a Undecagon shape?

In geometry, a hendecagon (also undecagon or endecagon) or 11-gon is an eleven-sided polygon. (The name hendecagon, from Greek hendeka "eleven" and –gon "corner", is often preferred to the hybrid undecagon, whose first part is formed from Latin undecim "eleven".)

What is an 11gon?

So, the sum of the interior angles of an 11-gon is 1620 degrees. Regular 11-gons: The properties of regular 11-gons: All sides are the same length (congruent) and all interior angles are the same size (congruent). To find the measure of the angles, we know that the sum of all the angles is 1620 degrees (from above)...

What is a nonagon shape?

A nine sided shape is a polygon called a nonagon. It has nine straight sides that meet at nine corners. The word nonagon comes from the Latin word "nona", meaning nine, and "gon", meaning sides. So it literally means "nine sided shape".

What is a pentagon shape?

A pentagon shape is a flat shape or a flat (two-dimensional) 5-sided geometric shape. In geometry, it is considered as a is a five-sided polygon with five straight sides and five interior angles, which add up to 540°. Pentagons can be simple or self-intersecting.

Is nonagon a polygon?

In geometry, a nonagon (/ˈnɒnəɡɒn/) or enneagon (/ˈɛniəɡɒn/) is a nine-sided polygon or 9-gon. The name nonagon is a prefix hybrid formation, from Latin (nonus, "ninth" + gonon), used equivalently, attested already in the 16th century in French nonogone and in English from the 17th century.

Is Decagon a real word?

Decagon, dek′a-gon, n. a plane figure of ten angles and sides.

What is Heptagonal?

adjective. having seven sides or angles.

Is a five point star a decagon?

A regular star pentagon, {5/2}, has five corner vertices and intersecting edges, while concave decagon, |5/2|, has ten edges and two sets of five vertices. ...

What is an irregular Nonagon?

Irregular nonagon

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

What is pentagon sides?

A pentagon is any polygon that has five sides and five angles. The root of the word pentagon is “penta” which comes from the Greek word for five. “Gon” comes from the Greek word for angle.

How many diagonal are there in a decagon?

A decagon has (10 2) – 10 = 35 diagonals. Each pair of opposing sides has three diagonals which are parallel to them, so 5*3 = 15 of the diagonals are parallel to a side.