a) 5 cm
b) 10 cm
c) 15 cm
d) 20 cm
Answer: d
Explanation: Let the height of the cone be h cm
$$\eqalign{
& \frac{4}{3}\pi \times {\left( 5 \right)^3} = \frac{1}{3}\pi \times {\left( 5 \right)^2} \times h \cr
& \Rightarrow h = 20\,cm \cr} $$
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