Q. 195.0( 5 Votes )

A cubical block o

Answer :

Side of cubical block, a = 10 cm


Largest diameter that the hemisphere can have, d = 10 cm


Radius, r = 10/2 = 5 cm


Total surface area = Total surface area of cube + CSA of hemisphere - Area of base of hemisphere


= 6a2 + 2πr2 - πr2


= 6a2 + πr2


= 6(10)2 + 3.14(5)2


= 600 + 78.5 = 678.5 cm2


Rate for 100 cm2 painting = Rs. 5


Rate for 678.5 cm2 painting =


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