Question

4) The length and Breadth of a rectangle are 10 cm and 8cm respectively. Find it's perimeter if the senght Length
and breadth are
1) doubled
2) halved​

Answer 1

Answer:

(1) 2*10=20,2*8=16

2(20+16)

40+32

72

(2). 10/2=5,8/2=4

2(5+4)

10+8

18

Answer 2

Answer:

Step-by-step explanation:

Length of the rectangle = 10 cm

Breadth of the rectangle = 8 cm

(i) When they are doubled,

l = 10 × 2 = 20 cm

and b = 8 × 2 = 16 cm

Perimeter = 2(l + b) = 2(20 + 16) = 2 × 36 = 72 cm

(ii) When they are halved,

l = 10 /2 = 5 cm

b = 8/ 2 = 4 cm

Perimeter = 2(l + b) = 2(5 + 4) = 2 × 9 = 18 cm