Question

What is the length of the rectangle whose breadth is 10 cm & perimeter 60 cm.

(i) 15cm (ii) 16cm (iii) 20cm

(iv) 25cm​

Answer 1

Answer:

let length of rectangle be x cm

perimeter 60 cm

breadth 10cm

But perimeter = 2(L+b)

60= 2(L+10)

60/2 = L+10

30 -10 = L

L= 20 cm

(iii) 20 cm

Answer 2

Answer:

(iii)20 cm

Step by step explanation:

Perimeter = 2(l + b)

               

Given:

Perimeter = 60 cm

Breadth = 10 cm

60 = 2(l + 10)

60 = 2l + 20

2l = 60 - 20

l = 40/2

Hence, the length is 20 cm.