Question

A gardener want to fence a circular garden of diameter 21m. Find the length of rope he needs to purchase,if he makes 2 rounds of fence. Also find the cost of rope, if it's price is rs. 4.50 per meter.

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Answer 1

Answer:

Complete step by step solution:

Circumference of the circular garden is 66 m then it means to fence the garden once the gardener needs 66 m of rope. Length of the rope gardener needs to purchase for fencing two rounds = 132 m (Ans.)

Answer 2

Explanation:

Diameter of the circular garden=21m

∴ Radius of the circular garden=

2

21

m

Now, circumference of circular garden=2πr=2×

7

22

×

2

21

=22×3=66m

The gardener makes 2 rounds of fence so the total length of the rope of fencing =2×2πr=2×66=132m

Since the cost of 1 meter rope=Rs. 4

Therefore, cost of 132 meter rope=4× 132=Rs. 528.