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Circumference of circle=2 pi r
A. radius=21cm
circumference of circle=2*22/7*3=132cm
radius=d/2     r=70/2=35
circumference of circle-2*22/7*35=220
area of circle = pi r^{2} 
A.area of circle=22/7*21*21=1386cm^2
B.AREA OF CIRCLE=22/7*35*35=3850
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You have not taken out the area. Please help me a bit by solving the whole question
As we know that the area of a circle is pi r 2 ;
Therefore,22/7x 21 x 21 =1386cm2
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