a closed metallic cylinder has its base diameter 56cm and it is 2.25m high. find the cost of the metal used to make it if costs 80 per square metre
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Diameter of base of closed metallic cylinder = 56 cm
So, its radius; r = 56/2 = 28 cm = 0.28 m
Height; h = 2.25 m
Total surface area of metallic cylinder = 2πr(r+h) = 2×22/7×0.28(0.28+2.25) = 2×22/7×0.28×2.53 =4.4528 m2
Cost of making per square meter of metal = Rs.80
So, total cost of making the whole metal = 4.4528×80 = Rs.356.224
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So, its radius; r = 56/2 = 28 cm = 0.28 m
Height; h = 2.25 m
Total surface area of metallic cylinder = 2πr(r+h) = 2×22/7×0.28(0.28+2.25) = 2×22/7×0.28×2.53 =4.4528 m2
Cost of making per square meter of metal = Rs.80
So, total cost of making the whole metal = 4.4528×80 = Rs.356.224
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