Question

-) A gardener wants to fence a circular garden of diameter
21 m. Find the length of the rope he needs to purchase,
if he makes 2 rounds of fence. Also find the cost of
the rope, if it costs 74 per metre.​

Answer 1

Answer:

Rs 9768

Step-by-step explanation:

radius of circle = diameter ÷ 2

                         = 21/2 m

Now, length of rope = 2 × circumference

                                  = 2 × (2 × π × r)

                                  = 2 × (2 × 22/7 ×21/2)

                                  = 2 × 66

                                  = 132 m

Cost = 132 × 74

        = Rs 9768

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Answer 2

Answer:

Diameter of the circular garden = 21 m

∴ Radius = 21 / 2 m

∴ Circumference = 2πr = 2×22 / 7×21 / 2

= 66 m

Length of rope needed for 2 rounds

= 2 × 66 m = 132 m

Cost of the rope = ₹4 × 132 = ₹ 528

Step-by-step explanation:

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