Question

The radius of the circular garden is 21 m find the cost of three layered fencing for the garden at the rate of ₹ 25 per meter. Option 1) ₹8900. 2) ₹10800. 3) ₹9009. 4) ₹9900.​

Answer 1

Answer:

$its \: perimeter \: = 2\pi \: r \\ perimeter \: = 2 \times 22 \div 7 \times 21 \\ = 2 \times 22 \times 3 \\ 3 \: layers \: of \: fence = 2 \times 22 \times 3 \times 3 = 396 \\ cost \: of \: fence = 25 \\ total \: cost \: = 25 \times 396 = rs \: 9900$

option (d) ₹9900

Step-by-step explanation:

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