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.

What 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.

Shape of a 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.

Shape of a Square

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

Shape of a Parallelogram

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

Shape of a Rhombus

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

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

Simple Closed Curves


Different Types of Polygons




Circle Math

Line Symmetry

Symmetrical Shapes

4th Grade Math Activities

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