Page 159 - Maths Class 04

Perimeter of a Square A 8 cm D
A square has four equal sides.

Perimeter = Sum of all its sides.
= AB + BC + CD + DA 8 cm 8 cm

= 8 cm + 8 cm + 8 cm + 8 cm

or 4 × one side of square
= 4 × 8 = 32 cm B C
8 cm

Perimeter of a Rectangle

A rectangle has four sides. The opposite sides are equal.
Perimeter = Sum of all its sides.

or 2 × (Length + Breadth) A 9 cm D

= 2 cm + 9 cm + 2 cm + 9 cm
= 2 × 2 cm + 2 × 9 cm 2 cm 2 cm

= 2 (2 + 9) cm

= 2 × 11 cm B C
9 cm
= 22 cm

Longer side of a rectangle is called its length and

shorter side is called its breadth or width.

Practice - 11.1
Practice - 11.1
Practice - 11.1
Practice - 11.1
1. Find the perimeter of the following figures.

a. b. 7 cm

3 cm 5 cm
4 cm

6 cm

c. 5 cm d.
1 cm 1 cm 1 cm 1 cm 1 cm 1 cm
2 cm 2 cm
3 cm 3 cm
5 cm 5 cm

2 cm 2 cm
6 cm
1 cm 1 cm

5 cm

Mathematics-4 159