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Question

The given figure represents a solid consisting of a cylinder surmounted by a cone at one end and a hemisphere at the other. Find the volume of the solid.


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Solution

Radius of cone = radius of cylinder = radius of hemisphere = 3.5cm
height of cylinder = 6.5cm
height of cone = 12.6 - 6.5 = 6.1 cm

Volume of Solid = Volume of cone + Volume of cylinder + Volume of hemisphere

=13πr2hcone+πr2hcyl+23πr3

=πr2(13hcone+hcyl+23r)

=227×3.5×3.5(13×6.1+6.5+23×3.5)

=38510(2.033+6510+23.3310)

=38510×10.866

=418.341 cm3


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