** 3.8 SUMMARY**

**Polygon**– Polygon is a combination of two Greek words Polus + Gonia, in which Polus means many and Gonia means Corner or angle.- Classification of Polygons

Polygons are classified as per their sides or vertices they have.

( a ) **Triangle** – A triangle has three sides and three vertices.

A triangle is of three types Equilateral, Isosceles and Scalene.

( b ) **Quadrilateral** – A quadrilateral has four sides and consecutively four vertices.

( c ) **Pentagon** – ( Penta stands for five ) A pentagon has five sides and five vertices.

( d ) **Hexagon** – ( Hexa stands for six ) A hexagon has six sides and six vertices.

( e ) **Heptagon** – ( Hepta stands for seven ) A heptagon has seven sides and seven vertices.

( f ) **Octagon** – ( Octa stands for eight ) an octagon has eight sides and eight vertices.

( g ) **Nonagon** – ( Nona stands for nine ) A nonagon has nine sides and nine vertices.

( h ) **Decagon** – ( Deca stands for ten ) A decagon has ten sides and ten vertices.

**Diagonals:**A line segments which connects two non – consecutive vertices of a polygon is called diagonal.

** ** The diagonals of a rectangle are always equal.

- Quadrilaterals are one type of polygon which has four sides and four vertices and four angles along with 2 diagonals. There are various types of quadrilaterals.

**Types of Quadrilaterals:**

The classifications of quadrilaterals are dependent on the nature of sides or angles of a quadrilateral and they are as follows**: **

- Trapezium
- Kite
- Parallelogram
- Square
- Rectangle
- Rhombus