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Find the cost of fencing a semi-circular garden of radius 7 m at Rs. 10 per metre.

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Find the cost of fencing a semi-circular garden of radius 7 m at Rs. 10 per metre.
A. Rs.720
B. Rs.360
C. Rs.180
D. Rs.90
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Correct Answer - B
Perimeter of semicircle = `pir+2r`
`=(22)/(7)xx7+2xx7=22+14=36m`
`therefore "The cost of fencing "=36xx10="Rs."360`
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