a cylinder without a lid has to be tin coated on its sides .if the radius of the base is 70cm and its height is 1:4m, calculate the cost of tin coating it at the rate of rupees 7 per 1000cm3
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LSA=26m²
=>2h(l+b)=26m²
=>h(l+b)=13m²
=>lh+bh=13m²..........................(2)
substitute (2) in (1)
=>lb+13=20m²
=>lb=7m²
area=lb=7m²
=>2h(l+b)=26m²
=>h(l+b)=13m²
=>lh+bh=13m²..........................(2)
substitute (2) in (1)
=>lb+13=20m²
=>lb=7m²
area=lb=7m²
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