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The curved surface of a cylindrical bulb of height 18 cm and base radius 7 cm is to be painted in luminating gold colour such that 23rd of the height of the bulb emits golden light; painting is done at ₹ 5 per sq. cm. The cost of painting the bulb is_____. (use π=227) |
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Answer» The curved surface of a cylindrical bulb of height 18 cm and base radius 7 cm is to be painted in luminating gold colour such that 23rd of the height of the bulb emits golden light; painting is done at ₹ 5 per sq. cm. The cost of painting the bulb is_____. |
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