What is the area of a semi-circle with circumference 88cm?
A
400 sq cm
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B
420 sq cm
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C
440 sq cm
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D
460 sq cm
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Solution
The correct option is D460 sq cm Circumference of semi-circle=88cmπr+2r=88cmr(227+2)=88r(367)=88r=88×736=1549cm area of semi-circle=12πr2=12×227×1549×1549≈460cm2(approx).