# Q : 8    A dome of a building is in the form of a hemisphere. From inside, it was white-washed at the cost of . If the cost of white-washing is Rs 20 per square metre, find the            (i) inside surface area of the dome

Given,

is the cost of white-washing  of the inside area

is the cost of white-washing  of inside area

(i) Therefore, the surface area of the inside of the dome is

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