1.

Find the cost of fencing a semi-circular garden of radius 7 m at Rs. 10 per metre.A. Rs.720B. Rs.360C. Rs.180D. Rs.90

Answer» Correct Answer - B
`"Perimeter of a semicircle"=pir+2r`
`=(22)/(7)xx7+2xx7=22+14=36m` ltBrgt `therefore" The cost of fencing"=36xx10="Rs."360`


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