Question
The outer radius of a hollow metallic spherical ball is
12 cm while the thickness of the metal used to make it is 6 cm. Find the volume of the metal used in making this ball.Solution
Inner radius of the ball= (12-6) =6cm Required volume= 4π/3 (12³ -6³) =4π/3(1728-216) = =4π/3 ×1512=2016π
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