Adjacent figure is consist of 4 semicircles and 2 quarter circles, if OA=OB=OC=OD = 28 cm, find the area of shaded region.
A
308 cm2
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B
616 cm2
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C
1232 cm2
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D
2462 cm2
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Solution
The correct option is C 1232 cm2 Quarter circle has angle 360o4 = 90o
Area of shaded region = Area of semicircle having diameter OD +Area of sector DOB having angle 90o -Area of semicircle having diameter OB +Area of semicircle having diameter OC +Area of sector COA having angle 90o -Area of semicircle having diameter OA
As OA=OB=OC=OD = 28 cm, hence Area of semicircle having diameter OB = Area of semicircle having diameter OD Area of semicircle having diameter OC = Area of semicircle having diameter OA Hence Area of shaded region = Area of sector DOB having angle 90o + Area of sector COA having angle 90o
As both sectors has same radius and angle
Area of shaded region = 2×area of sector DOB having angle 90o = 2×(angle360o×πr2) = 2×(90o360o×π×282) = 2×(14×227×784) = 11×7847 = 1232 cm2