a) 9 cm
b) 36 cm
c) 54 cm
d) 81 cm
Answer: d
Explanation:
$$\eqalign{
& \frac{{\frac{4}{3}\pi {r^3}}}{{4\pi {r^2}}} = 27 \cr
& \Rightarrow r = 81\,cm \cr} $$
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