Q : 8    A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of \small Rs\hspace{1mm}4989.60. If the cost of white-washing is Rs 20 per square metre, find the

            (i) inside surface area of the dome

Answers (1)

Given,

\small Rs\hspace{1mm}20 is the cost of white-washing 1\ m^2 of the inside area

\small Rs\hspace{1mm}4989.60 is the cost of white-washing \frac{1}{20}\times4989.60\ m^2 = 249.48\ m^2 of inside area

(i) Therefore, the surface area of the inside of the dome is 249.48\ m^2

 

 

 

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