The CSA of a cylinder of height $14$ cm is $264 \text{ cm}^{2}$. Find its radius. Use $\pi=\dfrac{22}{7}$.

The CSA of a cylinder of height $14$ cm is $264 \text{ cm}^{2}$. Find its radius. Use $\pi=\dfrac{22}{7}$.
  1. $3$ cm
  2. $5$ cm
  3. $7$ cm
  4. $2$ cm

Solution

$2\pi r h = 264 \Rightarrow 2 \times \dfrac{22}{7} \times r \times 14 = 264 \Rightarrow 88 r = 264 \Rightarrow r = 3$ cm.

Asked in: IMO

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