The diameter of larger semicircle =28cm.
Radius of larger semicircle, R= Diameter/2=28/2
Diameter of smaller semicircle =14cm.
Radius of smaller semicircle, r= Diameter/2=14/2
+ Area(large semicircle)
- Area(small semicircle)
=392 + 308-77=623
∴ Area of the shaded region is 623cm2
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