area enclosed between two concentric circles is 616 CM sq. and the radius of the inner circle is 31 centimetre. find the radius of the outer circle
area enclosed between two concentric circles is 616 CM sq. and the radius of the inner circle is 31 centimetre. find the radius of the outer circle
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Area of inner circle = πr sq.
= 22/7 × 31 cm × 31 cm
= 3020.28 cm sq.
Area of outer circle = πr sq.
616 cm sq. = 22/7 × r sq.
616 × 7/22 = r sq.
196 = r sq.
14 cm. = radius