What is a quadrilateral?

A simple closed curve or a polygon formed by four line-segments is called a **quadrilateral**.

The four line-segments forming a quadrilateral are called its sides.

The symbol of a quadrilateral is **□**.

Each shape shown below is a quadrilateral.

**(i)** Shape (d) is a special type of quadrilateral. Its opposite sides are equal. Each angle of it is a right angle. Its name is **rectangle**.

**(ii)** The quadrilateral (e) is named as **square**. All the sides of it are of equal measure and each angle is a right angle.

**(iii)** Shape (f) is a quadrilateral having the special name **parallelogram** and with opposite sides equal and parallel.

**(iv)** Shape (g) is the shape of a **rhombus** whose all sides are equal.

**(v)** The quadrilateral (h) is the shape of a **trapezium**.

A polygon covers a plane space whose area may be calculated. The length of the covering sides is called its **perimeter**.

**Related Concepts on ****Geometry - Simple Shapes & Circle**

● Polygon

● Angle

● Triangle

**4th Grade Math Activities
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