1.

(i) A hemisphere of maximum possible diameter is placed over a cuboidal block of side 7 cm. Find the surface area of the solid so formed. (ii) A cubical block of side 10 cm is surmounted by a hemisphere. What is the largest diameter that the hemisphere can have ? Find the cost of painting the total surface area of the solid so formed, at the rate of Rs. per 100 sq cm. [Use pi=3.14.]

Answer»


Solution :(II) LARGEST possible DIAMETER = edge of the cube. ltbtgt Total surface AREA of the solid = surface area of the cube - area of the top of the hemisphericalpart + curved surface of the hemisphere.


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