Question

The area of a circle is 13.86 hectares. The cost of fencing it at ₹ 4 per metre is

Answer 1

answer = ₹5280

since, Area = 13.86 × 10000 m^2 = 138600 m^2

therfore πr^2 = 138600 m^2

22/7 × r^2 = 138600

= r = √138600/ 22 × 7

= r = 210 m

Perimeter of a circle = 2πr = 2 × 22/7 × 210 = 1320 m

The cost of fencing it at ₹4 per metre = 1320 × 4

= ₹5280 ans.