The length and breadth of a rectangular piece of paper are 28 cm and 14 cm respectively. A semi-circular portion is cut off from the breadth’s side and a semi-circular portion is added on length’s side, as shown in Fig. 8. Find the area of the shaded region. .
The diameter of larger semicircle =28cm.
Radius of larger semicircle, R= Diameter/2=28/2
R=14cm
Diameter of smaller semicircle =14cm.
Radius of smaller semicircle, r= Diameter/2=14/2
r=7cm
Area(shaded region)=Area(rectangle)
+ Area(large semicircle)
- Area(small semicircle)
Area(shaded region)
= 
= 
=392 + 308-77=623
∴ Area of the shaded region is 623cm2
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