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More Lessons for Geometry, Math Worksheets

In this lesson, we will learn

### Polygon

## Types of Polygons

### Simple Polygons or Complex Polygons

### Convex Polygons or Concave Polygons

### Equilateral Polygon

### Equiangular Polygon

### Regular Polygons or Irregular Polygons

### Naming Polygons

### Worksheets

What is the difference between a regular and irregular polygons?

The following video explains what are polygons, defines regular and irregular polygons and their features.
Interior Angles in Convex Polygons

The following video will show you the different types of polygons based on their sides and angles measures.

The following video gives some examples of classifying polygons. Convex Hexagon, Concave Octagon, Convex Equilateral Nonagon.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

More Lessons for Geometry, Math Worksheets

In this lesson, we will learn

- polygons
- types of polygons
- simple or complex
- convex or concave
- equilateral
- equiangular
- regular or irregular

- names of polygons (with worksheets)

A polygon is a closed shape that has three or more sides. Each side is a line segment. The line segments form the sides of the polygon.

The following are examples of polygons:

The following figures are **not** polygons:

The sides of a **simple polygon** do not intersect. In a simple polygon, the line segments meet in pairs to form the vertices. Usually the word "simple" is omitted and the word "polygon" is used to mean "simple polygon".

A **complex polygon** has intersecting sides.

A **convex polygon** has all angles less than 180 ° .

A **concave polygon** has at least one angle greater than 180°. (*memory tool: concave has a "cave" in it*)

An **equilateral polygon **is a polygon which has all sides of the same length. A rhombus is an example of an equilateral polygon.

An **equiangular polygon** is a polygon whose interior angles are equal. A rectangle is an example of an equiangular polygon

A **regular polygon** is a polygon with equal
sides and equal angles otherwise it is an **irregular polygon**. A regular polygon is both equilateral and equiangular.

Some polygons have special names, depending on the number of sides they have.

Number of sides

Name of polygon3

Triangle

4

Quadrilateral

5

Pentagon

6

Hexagon

7

Heptagon

8

Octagon

9

Nonagon

10

Decagon

11

Hendecagon

12

Dodecagon

For polygons with more sides, it is easier and quite common to use a number to indicate the number of sides. For eg. 15-gon or 23-gon.

Practice the names of polygons with the following worksheets

Names of Polygons - Give the number of sides

Names of Polygons - Give the names of polygons

The following video will show you how to define a polygon, how to distinguish between concave and convex polygons, how to name polygons.

The following video explains what are polygons, defines regular and irregular polygons and their features.

The following video will show you the different types of polygons based on their sides and angles measures.

The following video gives some examples of classifying polygons. Convex Hexagon, Concave Octagon, Convex Equilateral Nonagon.

Rotate to landscape screen format on a mobile phone or small tablet to use the **Mathway** widget, a free math problem solver that **answers your questions with step-by-step explanations**.

You can use the free Mathway calculator and problem solver below to practice Algebra or other math topics. Try the given examples, or type in your own problem and check your answer with the step-by-step explanations.

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