the circumference of two concentric circles are 121 and 154 centimetre calculate the difference between the radius
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2pi r=121
or, inner radius r=190cm
2piR=154
or, outer radius R=242cm
now difference of radius= R-r=52cm
or, inner radius r=190cm
2piR=154
or, outer radius R=242cm
now difference of radius= R-r=52cm
anshu213:
now i understand
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