Question

the perimeter of a rectangle is 140 cm and it's length is 42 cm . the breadth of the rectangle is ​

Answer 1

Perimeter of rectangle = 2(l+b)

140 cm = 2(42 cm+b)

140 cm = 84cm + 2b

140 cm - 84 cm = 2b

56 cm = 2b

56 cm/2 = b

28 cm = b

The breadth of the rectangle is 28 cm.

Answer 2

Step-by-step explanation:

Perimeter of rectangle = 140 cm (given)

length = 42 cm

perimeter of rectangle = 140 cm

2(L + B) = 140

2(42 + B) = 140

84 + 2B = 140

2B = 140 - 84

2B = 56

B = 28

breath = 28 cm.