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
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