Question
There are 4 semi-circular gardens on each side of a square -shaped pond with each side 21 m. The cost of fencing the entire plot at the rate of Rs. 12.50 per mere is :
Answer: Option B
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Length of the fence = 4 `pi`R, where R = `21/2` m.
= `(4 x 22/7 xx 21/2)` m = 132 m
Cost of fencing = Rs `(132 xx 25/2)` = Rs. 1650.
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