Question

The area of circular plot is 3850 m2 . Find the radius of plot .find the cost of fencing the plot at rupees 10 per metre.

Answer 1

Area of circle = pie r square

3850 = 22/7×r square

so, 3850×7/22 = r square

1225 = r square

root 1225 = r

25 m = r

Now,

Rs.1 = 25 m

so, Rs.10 = 250 m

that is your answer .....

hope it will help you

Answer 2

Area=3850

let the radius be r

formulae to find area = πr2

22/7×r2=3850

r2= 3850÷22/7

r2=3850×7/22

r2=1225.63

r=√1225.63

r=35.00

CIRCUMFERENCE OF CIRCLE=2πr

=22/7 ×22/7 × 35

=345.71

COST OF FENCING PER METRE=10

=345.71×10=3457.1

I HOPE IT HELPS