Question

If the diameter of a circular pond is 84 m, find the cost of fencing around it with four rounds at Rs 12 per metre. find its radius. (TT - 22​

Answer 1

Step-by-step explanation:

Given diameter of a circular pond: 84 m.

Therefore Radius = D/2 = 84/2 = 42 m.

Circumference of the pond: (Assuming π = 22/7)

• 2*π*r
• 2*22/7*42 = 22*2*6 = 264 m

Given for fence it costs for 1 metre --> Rs. 12

For 264 meters,or for 1 round,it would cost the fence: 264*12 = Rs. 3168

We have to find the cost of fencing around for 4 rounds

• Note that 1 round = Circumference of the pond = 264 => For four rounds of fencing = 4*264 m = 1056 m

Thus for four rounds, it costs 4*3168 = Rs. 12672