In the given fig. a semi-circle is drawn with O as center and AB as diameter. Semi-circles are drawn with AO and AOB as diameter. If AB= 28, find the area of shaded region.
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AB=24cm
Therefore AO=BO=12cm
Because O is the midpoint of AB
Area of semicircle with diameter AB
pi r² = 3.14 × 12 × 12
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