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The curved surface of a cylindrical bulb of height 18cm and base radius 7 cm is to be painted in luminating gold colour such that 2/3 rd of the height of bulb emits golden light, painting is done at Rs. 5 per sq. cm. The cost of painting the bulb is (pi =227) |
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Answer» The curved surface of a cylindrical bulb of height 18cm and base radius 7 cm is to be painted in luminating gold colour such that 2/3 rd of the height of bulb emits golden light, painting is done at Rs. 5 per sq. cm. The cost of painting the bulb is (pi =227) |
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