Quadrilateral has

  • 4 sides
  • 4 angles
  • 2 diagonals
    1.jpg

To draw quadrilateral, we need any 5 measurements (not 4)

  • 4 sides & 1 diagonal
  • 3 sides & 2 diagonals
  • Two adjacent sides and three angles
  • 3 sides and two included angles
  • When other special properties are known. (Like square’s side)

Let’s look at them one by one

 

Why does Quadrilateral need 5 measurements? Why not 4?

 

We know that to draw a triangle,

we need 3 measurements – 3 sides, 2 angle 1 side etc.

So, for Quadrilateral, we should need 4 measurements

Eg: 4 sides

Let’s draw a quadrilateral with 4 sides as 5 cm, 4 cm, 5 cm, 4 cm

To construct it, let’s assume we have 4 sticks of sizes - 5 cm, 4 cm, 5 cm, 4 cm

2.jpg

 

Let’s connect the lines to make a quadrilateral

We can join the lines like

3.jpg

Or like

4.jpg

Thus,

we get different quadrilaterals when we have 4 measurements.

So, to get one quadrilateral,

we need 5 measurements

In this chapter, we will learn how to make a quadrilateral when

  • 4 sides and diagonal given
  • 2 Diagonals and 3 sides given
  • 2 Adjacent Sides and 3 angles given
  • 3 Sides and 2 angles given
  • Constructing Special Quadrilaterals like Square, Rectangle, Parallelogram, Rhombus

 

Let’s learn them one by one

 

 

  1. Chapter 4 Class 8 Practical Geometry
  2. Concept wise

About the Author

Davneet Singh's photo - Teacher, Computer Engineer, Marketer
Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.