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The base diameter of a cone is 14cm, and its volume is 462 cm3. Find...

Mathematics
WAEC 2002

The base diameter of a cone is 14cm, and its volume is 462 cm3. Find its height. [Taken \(\pi = \frac{22}{7}\)]
  • A. 3.5cm
  • B. 5cm
  • C. 7cm
  • D. 9cm
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Correct Answer: Option D
Explanation
From \(V = \frac{1}{3}\pi r^2 h. \hspace{1mm} r =\frac{14}{2}\\
462 = \frac{1}{3} \times \frac{22}{7} \times 7^2 \times h \\
h = \frac{3 \times 462}{22 \times 7}\\ h = 9\)

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