A rectangular strip of dimensions 21cm*7cm is rolled along the longer side. Find the radius of the base of the cylinder.
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Step-by-step explanation:
When it is rolled along the length, the length becomes the perimeter of the circle.
Thus, 2*pi*r = 21
= 2*22/7*r = 21
44/7*r=21
R=21*7/44
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