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a cylindrical vessel opens at the top has diameter 20 CM and height 14 cm find the cost of tin plating it on the inside at the rate of 50 paise per 100 square centimetre |
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Answer» R = 10 cmh = 14 cminner area = inner curved surface area + base area = 2πrh +πr² = 2×(22/7)×14×10 + (22/7)×10² = 880 + 314.28 = 1194.285 cm²rate = 5p per cm²cost = 1194.285×5 = 5971.4285 p = 59.714 rupees |
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