Answer :

Given.


A Solid is made by mounting 2 hemisphere on cylinder


The radius of the hemisphere is 20 cm.


The total height of the cylinder is 35 cm


Formula used/Theory.


Curve surface area of Cylinder = 2πrh


Curve surface area of Hemisphere = 2πr2


As we put 2 hemisphere on both sides of Cylinder


Area of Solid is sum of CSA of both hemisphere and of cylinder


Area of Solid = CSA of cylinder + 2 × CSA of Hemisphere


= 2πrh + 2 × (2πr2)


= 2πr[h + 2r]


Area of solid




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