If the diameter of a cylinder is $14$ cm and its height equals its diameter, then its TSA is (use…

If the diameter of a cylinder is $14$ cm and its height equals its diameter, then its TSA is (use $\pi=\dfrac{22}{7}$):
  1. $616 \text{ cm}^{2}$
  2. $924 \text{ cm}^{2}$
  3. $308 \text{ cm}^{2}$
  4. $462 \text{ cm}^{2}$

Solution

$r = 7, h = 14$. TSA $= 2\pi r (r+h) = 2 \times \dfrac{22}{7} \times 7 \times 21 = 44 \times 21 = 924 \text{ cm}^{2}$.

Asked in: IMO

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