Find the TSA of a cylinder whose radius is $3.5$ cm and height $10$ cm. Use $\pi=\dfrac{22}{7}$.

Find the TSA of a cylinder whose radius is $3.5$ cm and height $10$ cm. Use $\pi=\dfrac{22}{7}$.
  1. $220 \text{ cm}^{2}$
  2. $297 \text{ cm}^{2}$
  3. $77 \text{ cm}^{2}$
  4. $385 \text{ cm}^{2}$

Solution

TSA $= 2\pi r (r+h) = 2 \times \dfrac{22}{7} \times 3.5 \times 13.5 = 22 \times 13.5 = 297 \text{ cm}^{2}$.

Asked in: IMO

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