Q. 84.0( 219 Votes )

A dome of a build

Answer :

(i) Cost of white-washing the dome from inside = Rs 498.96

Cost of white-washing 1 m2 area = Rs 2


Therefore, CSA of the inner side of dome =


= 249.48 m2


(ii) Let the radius be r


CSA = 249.48 m2


2r2 = 249.48


2 ×  × r2 = 249.48


r = 6.3 m


Volume of air inside the dome = Volume of hemispherical dome


= πr3


= ×  × (6.3)3


= 523.908 m3

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