The radius of the inner boundary of a plane circular ring is 14 cm .The area of the ring is 346.5sq.cm .Find the radius of the outer boundary
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area = π(R^2-(14)^2)
346.5=3.14(R^2-196)
110.35=R^2-196
By solving R=17.5 cm
346.5=3.14(R^2-196)
110.35=R^2-196
By solving R=17.5 cm
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