Question
What will be he area of a semi-circle whose perimeter is 36 cm ?
Answer: Option A
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Given : `pi R + 2 R = 36`
`hArr ( pi + 2) R = 36`
`hArr R = (36)/(22/7 + 2) cm.`
`hArr R = (36 xx 7)/(36)` cm = 7 cm.
`:.` Required area = `pi R_2 = (22/7 xx 7 xx 7) cm^2` = 154 `cm^2`
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