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A. radius=21cm

circumference of circle=2*22/7*3=132cm

B.diameter=70mm

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

As we know that the area of a circle is pi r 2 ;

Therefore,22/7x 21 x 21 =1386cm2____

Therefore,22/7x 21 x 21 =1386cm2