Answer :

Given, internal radius of hollow sphere, r = (4/2) = 2cm

External radius = 8/2 = 4cm


Volume of hollow sphere =


--------(i)


Given, diameter of the cone = 8cm


Radius of the cone = 4 cm


Let height of the cone be h


Volume of the cone =


--------(ii)


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



h = 12cm


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