Question

the area of a square field is 81 hectare .Find the cost of fencing the field at the rate of Rs 2.50per sq.m

Answer 1

81 hectere = 810000 sqaure metre
area of square = s²
s²=810000 
s=√810000
s= 900 metre
perimeter of field = 4s = 4 x 900
= 3600 metre
cost = 3600 x 2.5
= Rs 9000

Answer 2

Heya

Area of the square field= 81hectare

1 hectare = 10000 square metres

81 hectare = 810000 square meters

Let the side of the field be x

x² = 810000

x = √810000

x = 900

Perimeter of the square field = 4x

= 4 (900)

= 3600m

Cost of fencing = Rs.2.5 for m

Total cost of fencing = 3600×2.5

= RS.9000