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A hollow sphere of internal and external diameter 4cm and 8cm is melted into a cone of base diameter 8cm. Calculate height of cone?

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Given internal diameter of hollow sphere (r) = 4cm 

External diameter R = 8cm

Given diameter of cone = 8cm 

Radius of cone = 4cm 

Let height of cone be h

Since hollow sphere is melted into a cone so there volumes are equal

(1) = (2)

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