- Books Name
- class 8 th Mathematics Book

- Publication
- ReginaTagebücher

- Course
- CBSE Class 8

- Subject
- Mathmatics

**Understanding Quadrilaterals**

**Polygons and its types**

**Nature of polygon, **

**Line and Line segments: ** A line segment is the shortest distance between two points. The line segment joining points A and B denoted by AB¯¯¯¯¯.

A line can be obtained from a line segment like AB←→ is extended on both sides indefinitely.

*Polygon is made up of line segments. Triangle is the smallest polygon made up of three line segments, a quadrilateral is a polygon made up of four line segments, a pentagon is made up of five line segments and so on.*

*all six figures are polygons.*

**Classification of polygon**

Polygons are classified according to the number of sides (or vertices) as follows:

**Concave and convex polygon: **If each of the interior angles of a polygon is less than 180°, then it is called a convex polygon. If at least one angle of a polygon is more than 180°, then it is called a concave polygon.

*each of the interior angles is less than *180°*. So they are called convex polygons.*

**Regular and irregular polygon:** A regular polygon is a polygon whose all sides and all angles are equal. Thus, a regular polygon is both equiangular and equilateral.

*In the above polygons, each of the sides and angles is equal. So they are regular polygons.*

If at least one side measures are different and at least one angle measures are different when compared to others. So they are irregular polygons.

**Diagonals of a polygon**

**Adjacent vertices: **The end-points of the same side of a polygon are called the adjacent vertices.

**Adjacent sides: **Sides of a polygon that have a common vertex are called adjacent sides. If the sides of a polygon don't have any common vertex is called non-adjacent sides.

**Diagonals: **The line segments obtained by joining vertices which are not adjacent are called the diagonals of a polygon.

**The number of diagonals of a convex polygon:** If there are n-sides in a convex polygon and n>3, then it has

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## Batch List

###### EDUCARE

Course : CBSE Class 8

Start Date : 03.02.2023

End Date : 01.03.2023

Types of Batch : Live Online Class

###### Medha Sharma

Course : CBSE Class 8

Start Date : 02.02.2023

End Date : 01.09.2023

Types of Batch : Classroom