From inside, it was white-washed at the cost of 4989.60. If the cost of white-washing is * 20 per square metre, find the (i) inside surface area of the dome, (ii) volume of the air inside the dome?
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Total cost = 498.96 Rs. => Area whitewashed = 249.48 Rs. And according to the question, the area whitewashed is Curved surface area of hemisphere. => 523.908 m³ (approx.)
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