A rectangular sheet of paper $44$ cm $\times 18$ cm is rolled along its length to form a cylinder (so its…

A rectangular sheet of paper $44$ cm $\times 18$ cm is rolled along its length to form a cylinder (so its length becomes the circumference). The radius of the base is (use $\pi=\dfrac{22}{7}$):
  1. $7$ cm
  2. $14$ cm
  3. $3.5$ cm
  4. $11$ cm

Solution

Length becomes circumference: $2\pi r = 44 \Rightarrow r = \dfrac{44 \times 7}{2 \times 22} = 7$ cm.

Asked in: IMO

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