Mathematics · Mensuration

A rectangular sheet of paper 40 cm × 22 cm is rolled along its length to form a hollow cylinder of height 40 cm. The radius of the cylinder (in cm) is: (use π = 22 7 )

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A rectangular sheet of paper 40 cm &times; 22 cm is rolled along its length to form a hollow cylinder of height 40 cm. The radius of the cylinder (in cm) is: (use &pi; = 22 7 )