Question

a gardener wants to fence a circular garden of diameter 21 metre. find the length of the wire we want to purchase and cost of it at the rate of rs. 4 per meter


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Answer 1

Answer:

GIVEN

diameter=21m

radius=21÷2

Circumference of a circle=2×π×radius

2×22÷7×21÷2

circumference=66m(approx)

the cost=4×66

=rs.264

• THEREFORE COST=264

• LENGTH=66m

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Answer 2

Answer:

$\fbox \pink{diameter} = 21m \\ \\ \fbox \purple{radius} = \frac{21}{2}m \\ \\ \fbox \red{circumference} = 2\pi \: r \\ \\ 2 \times \frac{22}{7} \times \frac{21}{2} = \frac{22}{7} \times 21 \\ \\ 22 \times 3 = 66m \\ \\ \fbox \green{length \: of \: rope \: required} = 2 \times 66 = 132m \\ \\ \fbox \blue{cost} = 1m \: rope = 4 \\ \\ 132m \: rope = 4 \times 132 = 528$