a) 1 m
b) 2 m
c) 3 m
d) 4 m
Answer: d
Explanation:
$$\eqalign{
& 3 \times 2\pi {r^2} = 2 \times 2\pi rh \cr
& \Rightarrow 6r = 4h \cr
& r = \frac{2}{3}h \cr
& r = \left( {\frac{2}{3} \times 6} \right)m \cr
& r = 4\,m \cr} $$
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