# Quick Answer: Which Is Not A Regular Polygon?

## What is an irregular shape called?

A polygon that does not have all sides equal and all angles equal.

(A polygon is “regular” only when all angles are equal and all sides are equal, otherwise it is irregular.).

## Which is a regular polygon?

In Euclidean geometry, a regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length). Regular polygons may be either convex or star.

## What is an example of an irregular polygon?

Irregular polygons can still be pentagons, hexagons and nonagons, but they do not have congruent angles or equal sides. Here are some examples of irregular polygons. In these polygons, some sides are clearly longer than others and some angles are wider than others, so they must be irregular. … The shape has 6 sides.

## Can a polygon be open?

Polygons can be classified as open or closed. A polygon is open when the segments do not all connect at the beginning and end. That is, if we draw the polygon starting at one point, we finish drawing at a different point.

## What is an sided polygon?

The segments of a polygonal circuit are called its edges or sides, and the points where two edges meet are the polygon’s vertices (singular: vertex) or corners. The interior of a solid polygon is sometimes called its body. An n-gon is a polygon with n sides; for example, a triangle is a 3-gon.

## What is a 9 sided shape called?

enneagonIn 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.

## What is the side of a regular polygon?

Names of Regular PolygonsRegular PolygonNumber of SidesExterior AnglesEquilateral triangle3 sides3 exterior angles of 120°Square4 sides4 exterior angles of 90°Regular pentagon5 sides5 exterior angles of 72°Regular hexagon6 sides6 exterior angles of 60°2 more rows

## What is not a polygon?

A figure or shape is not considered a polygon if it has rounded sides or if its sides intersects at any place other than at the ends of each side. Therefore a circle is not a polygon and an hourglass shape is not a polygon.

## Does every polygon have a regular version?

For a polygon to be ‘regular’ it must have all sides the same length and all interior angles the same. The figure above is actually an example of an equilateral polygon since it has all sides the same length, but it is not a regular polygon because its interior angles are not all the same.

## How many sides are on a polygon?

2D ShapesTriangle – 3 SidesSquare – 4 SidesPentagon – 5 SidesHexagon – 6 sidesHeptagon – 7 SidesOctagon – 8 SidesNonagon – 9 SidesDecagon – 10 SidesMore …

## What is the formula for a polygon?

Let’s recap. A regular polygon is a flat shape whose sides are all equal and whose angles are all equal. The formula for finding the sum of the measure of the interior angles is (n – 2) * 180. To find the measure of one interior angle, we take that formula and divide by the number of sides n: (n – 2) * 180 / n.

## What’s a 1 sided shape called?

List of n-gons by Greek numerical prefixesSidesNames1henagonmonogon2digonbigon3trigontriangle4tetragonquadrilateral7 more rows

## What is difference between regular and irregular polygon?

A regular polygon is a shape that has all sides and angles the same size. An irregular polygon is a shape that has different sized angles and sides.

## What’s a 13 sided shape called?

tridecagonIn geometry, a tridecagon or triskaidecagon or 13-gon is a thirteen-sided polygon.

## What’s a 6 sided shape called?

hexagonMore than Four Sides A five-sided shape is called a pentagon. A six-sided shape is a hexagon, a seven-sided shape a heptagon, while an octagon has eight sides…

## Is rhombus a regular polygon?

A regular polygon must be equilateral (all of its sides are the same length) and equiangular (all of its angles are the same measure). A rhombus is equilateral: all of its sides are of the same length. … A rhombus can never be a regular polygon because it is not equiangular.

## What are the 20 kinds of polygons?

Terms in this set (18)Three. Trigon or Triangle.Four. Tetragon or Quadrilateral.Five. Pentagon.Six. Hexagon.Seven. Heptagon.Eight. Octagon.Nine. Nonagon or Enneagon.Ten. Decagon.More items…

## What’s a 12 sided shape called?

dodecagonIn geometry, a dodecagon or 12-gon is any twelve-sided polygon.
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