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Three solid metallic spheres whose radii are 1 cm, x cm and 8 cm are m

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| Three solid metallic spheres whose radii are 1 cm, x cm and 8 cm are melted and recast into a single solid sphere of diameter 18 cm. the surface area (in cm2) of the sphere with radius x cm is :

A. 144π

B. 100π

C. 72π

D. 64π

Right Answer is: A

SOLUTION

A. T. Q.

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Surface area of sphere of radius  –

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    1. Three solid metallic spheres whose radii are 1 cm, x cm and 8 cm are m

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