**Category : **4th Class

The geometrical figure having four sides are called quadrilateral. Look at the following figures:

**Properties of Quadrilaterals**

- A quadrilateral has four sides.
- A quadrilateral has four vertices.
- A quadrilateral has four angles.
- Sum of all four angles of a quadrilateral is \[\text{36}0{}^\circ \]

- Sides of the quadrilateral ABCD are AB, BC, CD, and AD
- Vertexes of the quadrilateral ABCD are point A, point B, point C and point D
- Angles of the quadrilateral are\[\angle \text{ABC}\], \[\angle \text{BCD},\text{ }\angle \text{CDA},\]and\[\angle \text{DAB}\]
- Sum of all the four angles of the quadrilateral ABCD , \[\angle \text{A}+\angle \text{B}+\angle \text{C}+\angle \text{D}=\]\[\text{6}0{}^\circ +\text{12}0{}^\circ +\text{8}0{}^\circ +\text{1}00{}^\circ =\text{36}0{}^\circ \]

**Types of Quadrilateral**

In this chapter we will study about two types of quadrilateral:

- Rectangle
- Square

**Rectangle**

Rectangle is a quadrilateral in which (i) all angles are of\[\text{9}0{}^\circ \]and (ii) opposite sides are equal in length.

ABCD is a rectangle in which

(i) \[\angle \text{A}=\angle \text{B}=\angle \text{C}=\angle \text{D}=\text{9}0{}^\circ \]

(ii) AB = CD = 6 cm, and BC = AD = 4 cm.

**Square**

Square is a quadrilateral whose (i) All angles are of\[\text{9}0{}^\circ \]and (ii) All sides are equal

ABCD is a rectangle in which (i) \[\angle \text{A}=\angle \text{B}=\angle \text{C}=\]\[\angle \text{D}=\text{9}0{}^\circ \](ii)\[\text{AB}=\text{BC}=\text{CD}\]\[=\text{DA}=\text{5 cm}\]

*play_arrow*Triangle*play_arrow*Angle*play_arrow*Quadrilateral*play_arrow*Circle*play_arrow*Introduction

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