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A gardener wants to fence a circular garden of diameter 21m. The length of the rope and the cost of the rope are, if it costs $4 per meter and he makes 2 rounds of fence (Take $π = 227$ )

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Length = 130m, cost = $506

Length = 124m, cost = $510

Length = 120m, cost = $523

Length = 132m, cost = $528

answer is D.

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Detailed Solution

Given, radius =

212 m

.
Circumference =

2 π r

= 2 × 227 × 212 = 22 × 21 7 = 66 m

Length of rope is

= 2 × 66 = 132 m

Cost of rope is,

= (132 × 4) = $ 528

Cost = $528
Option 4 is correct.

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