A ball is to be made with inner radius of 2 units and outside radius of 3 units. How much material is required to make the ball?

inner radius of the ball, r = 2 units

outer radius of the ball, R = 3 units

Formula Used:  ​

Volume of the sphere = $$\frac{4}{3}\pi ( R^3 - r^3)$$ 

where, R = outer radius 

           r = inner radius 

Solution:  

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