Answer :

Surface area of a hemisphere = 2πr2


Given, dome of a building is in the form of a hemisphere. Its radius is 63 dm.


1 dm = 0.1m


Thus, 63 dm = 6.3 m


Surface area of the dome = 2 × (22/7) × (6.3)2 = 249.48 m2


Cost of painiting it at Rs. 2 per sq. m. = 249.48 × 2 = Rs. 498.96


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