Question on: WAEC Mathematics - 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 Option: D
From (V = \frac{1}{3}\pi r^2 h. \hspace{1mm} r =\frac{14}{2}<br /> 462 = \frac{1}{3} \times \frac{22}{7} \times 7^2 \times h <br /> h = \frac{3 \times 462}{22 \times 7}\ h = 9)
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