The height of a cylinder is equal to its radius. If the volume is 0.216
MATHEMATICS
WAEC 2011
The height of a cylinder is equal to its radius. If the volume is 0.216 π m3. Calculate the radius.
- A. 0.46m
- B. 0.60m
- C. 0.87m
- D. 1.80m
Correct Answer: B. 0.60m
Explanation
volume of cylinder = \(\pi r^2\)h
0.216\(\pi\) m\(^3\) = \(\pi \times r^2 \times h\)
Since r = h,
0.216 = r\(^3\)
r\(^3\) = 0.216
r = \(\sqrt[3]{0.216}\)
= 0.6
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