Question on: WAEC Mathematics - 1992
The volume of a cone of height 9cm is 1848cm\(^3\). Find its radius. [Take π = 22/7]
A
7cm
B
14cm
C
28cm
D
98cm
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Correct Option: B
1/3 πr\(^2\) x 9 = 1848
3 x πr2 = 1848 r2 = 1848/3 x 7/22 r = 14
\(\text{Volume of a cone} = \frac{1}{3} \pi r^2 h\)
\(\frac{1}{3} \times \frac{22}{7} \times r^2 \times 9 = 1848\)
\(r^2 = \frac{1848 \times 7}{22 \times 3}\)
\(r^2 = 196 \therefore r = 14cm\)
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