The surface area of a solid metallic sphere is 616 cm2. It is melted and recast into a cone of height 28 cm. Find the diameter of the base of the cone so formed 
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Surface area of the sphere 
⇒ 4πr2 = 616
⇒ r2 = 49
⇒ r = √49
⇒ r = 7 cm
Diameter of base = 7 × 2
= 14 cm
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