NCERT Exemplar Solutions
Class 6 - Mathematics - Unit 6: Mensuration - Problems and Solutions

Question 56

Find the breadth.

Formula for area of a rectangle:

( ext{Area} = ext{Length} imes ext{Breadth})

Put the values:

(1600 = 80 imes ext{Breadth})

Divide both sides by (80):

( ext{Breadth} = 1600 div 80)

( ext{Breadth} = 20 ext{ m})

Use the perimeter formula.

Perimeter of a rectangle:

(P = 2( ext{Length} + ext{Breadth}))

Put the values (( ext{Length} = 80 ext{ m}, ext{Breadth} = 20 ext{ m})):

(P = 2(80 + 20))

First add inside the bracket:

(80 + 20 = 100)

Now multiply by 2:

(P = 2 imes 100 = 200 ext{ m})