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Two identical cones are joined as shown in the figure. If radius of base is $4 \text{ cm}$ and slant height of the cone is $6 \text{ cm}$, then height of the solid is
- (a)$8 \text{ cm}$
- (b)$4\sqrt{5} \text{ cm}$
- (c)$2\sqrt{5} \text{ cm}$
- (d)$12 \text{ cm}$
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Ans: (B) $4\sqrt{5} \text{ cm}$