## Part Two

## Lesson 12 – Perimeter and Area

**Exercise**

**1. Find the perimeter of the figures given below.**

**(1)**

**Ans:**

Perimeter = 4 + 1 + 4 + 1

∴ Perimeter = 10 cm

**(2)**

**Ans:**

Perimeter = 3 + 3 + 3 + 3

∴ Perimeter = 12 cm

**(3)**

**Ans:**

Perimeter = 3 + 4 + 5

∴ Perimeter = 12 cm

**(4)**

**Ans:**

Perimeter = 2 + 7 + 2 + 7

∴ Perimeter = 18 cm

**(5)**

**Ans:**

Perimeter = 3 + 4 + 3 + 4

∴ Perimeter = 14 cm

**2. The sides of a rectangular field are 150m, 120m, 150m and 120m. Find the perimeter of the field.**

**Ans: **

Perimeter of the field = 150 + 120 + 150 + 120

∴ Perimeter of the field = 540 cm

Perimeter of the rectangular field is 540 cm

**Exercise**

**Find the area of the following figures (all small squares are of 1 sq cm area).**

**(1) **

**Ans:**

Area of identity card = number of squares

∴ Area of identity card = 6 + 6 + 6 + 6

∴ Area of identity card = 24 sq. cm

**(2) **

**Ans:**

Area of shape = number of squares

∴ Area of shape = 2 + 2

∴ Area of shape = 8 sq. cm

**(3) **

**Ans:**

Area of shape = number of squares

∴ Area of shape = 4 + 4 + 4 + 4

∴ Area of shape = 16 sq. cm

**(4) **

**Ans:**

Area of shape = number of squares

∴ Area of identity card = 7 sq. cm