Given ⇒ Diameter of largest semi circle(2R)=14cm
Diameter of small semicircle (2r1)=3.5cm
Diameter of two other semi circle=2×3.5=7cm
Therefore, diameter of third small semi circle(2r2)=14−7=7cm
Area of shaded region=Area of largest semi circle−2×area of small semi circle+area of semicircle of radius(r2)=7cm
Area of shaded region=πR22+πr222−2×πr212
Area of shaded region=12×227×7×7+12×227×72×72−2×12×227×3.52×3.52
=77+19.25−9.625=86.625cm2
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