Question

The cost of fencing a circular field at the rate of Rs.36 per metre is Rs.11880. The field is to be ploughed at the rate of Rs. 0.60 per sq.m. Find the cost of ploughing the field.

Answer 1

Hope it will help you

Answer 2

Answer:

Rs. 5,197.5

Step-by-step explanation:

Rate of fencing per metre = Rs. 36

Cost of fencing a circular field

at the rate of Rs.36 per metre = Rs.11880

Now, the circumference of circle = 11880/36

= 330 metre

We know that the circumference

of circle = 2 pie R ( R = Radius )

Circumference = 2 pie R = 330 metre

22

2 × ------ × R = 330

7

7 × 330

R = -------------

2 × 22

R = 52.5 metre

Therefore, the area of circle = pie R square

22

= ------ × 52.5 × 52.5

7

Area = 8,662.5 square metre

Now, cost of ploughing the field

at the rate of Rs. 0.60 per sq.m = 8,662.5 × 0.60

= Rs. 5,197.5