**Quadrilaterals and other polygons**

**Introduction:**

A **Quadrilateral** is a polygon with four sides and four vertices or corners. The word **quadrilateral** is made of the words quad (meaning "four") and lateral (meaning "of sides"). Quadrilaterals are simple or complex, also called crossed. Simple quadrilaterals are either convex or concave. A **Polygon** is traditionally a plane figure that is bounded by a closed path or circuit, composed of a finite sequence of straight line segments. The interior of the polygon is sometimes called its body.

## Types of quadrilaterals on quadrilaterals and other polygons

**Rhombus:**

ABCD is a parallelogram with a pair of adjacent sides AB and CD are equal. This type of parallelogram is called a Rhombus. The parallelogramin which pair of adjacent sides are equal is called a Rhombus. In otherwords, a rhombus is a quadrilateral in which opposite sides are parallel, and a pair of adjacent sides equal. Every rhombus is a parallelogram but the converse is not a parallelogram.

**Rectangle:**

PQRSis a parallelogram with ∠E = 90°. This type of a parallelogram which iscalled a rectangle. Thus, a parallelogram with an angle a right angle is called a rectangle. The rectangle is a quadrilateral in which conflicting sides in both the pairs of sides are parallel and an angle aright angle. Every rectangle is a parallelogram but the converse is nota parallelogram.

**Square:**

ABCDis a parallelogram with a pair of adjacent sides AB and AD are equal and ∠A = 90°. This type of parallelogram is called a Square.

**Trapezium:**

InTrapezium, a Quadrilateral which is slightest pair of opposite sides are same. A parallelogram is a quadrilateral in which both the pairs of opposite sides are parallel.

## Types of polygons on quadrilaterals and other polygons

**Triangle:**

Triangle is a type polygon which has three sides with different or equal length.

**Quadrilateral:**

Quadrilateral is a type of polygon which has four sides with different length and angle.

**Pentagon:**

Pentagon is a type of polygon which has five sides with different length and angle.

**Hexagon:**

Hexagon is a type of polygon which has six sides with different length and angle.