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area of the rectangular paper= area of the curve surface of the hollow cylinder
as material is same & there is no waste of material
rolling along length so height of cylinder is equal to the length of rectangular paper
therefore, length×breadth=2πrh
or,22×8 =2πr×22.
or, 4=πr
or, r= 4/π
we can put π=3.14 or 22/7 and find the value of radius r.
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