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Two identical cones are joined as shown in the figure. If radius of base is $4$ cm and slant height of the cone is $6$ cm, then height of the solid is:
Two identical cones are joined as shown in the figure. If radius of base is $4$ cm and slant height of the cone is $6$ cm, then height of the solid is:
(A) $8$ cm
(C) $2 \sqrt{5}$ cm
(B) $4 \sqrt{5}$ cm
(D) $12$ cm
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