in the adjoining figure, the area enclosed between the concetric circles is 770c?² . if the radius xof the outer circle is 21 cm, calculate the radius of inner circle
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Area of concentric circle =22/7*(R2-r2)
770 =22/7*(21*21)-r2
770*7/22=441-r2
35*7=441-r2
245=441-r2
441-245=r2
196=r2
14=r
770 =22/7*(21*21)-r2
770*7/22=441-r2
35*7=441-r2
245=441-r2
441-245=r2
196=r2
14=r
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