Question

A fence is to be erected around a circular field. the cost of fencing comes to Rs 2640at the cost rate of Rs 12 per metre. find the radius of the circular field

Answer 1

Answer:

Radius = 35 m

Step-by-step explanation:

Let Radius of the Circular field be R

We know that length of fencing = Perimeter or Circumference

∴ Length of fence = 2πR            [ Circumference of Circle = 2×π×radius]

Now, cost of 1 m Fence = Rs. 12

           ∴ Cost of 2πR m = 12 × 2πR

But total cost given is Rs. 2640

                    ∴ 12 × 2πR = 2640

$2\times \frac{22}{7} \times R = \frac{2640}{12}$

$R=\frac{220 \times 7}{22 \times 2}$

                              R = 35

∴ Radius of circular field is 35 m

Answer 2

Answer:

Radius= 35m

Hope it helps!!