A cylindrical block of wood has a radius 70cm. And length 2cm.met is to painted with blue coloured enamel. The cost of painting it is Rs.1.25 per 100cm.^2. Find the cost of polishing the block.
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Answer:
Area of a cylinder=2×pie×r(r+h)
radius=70 cm
height=2 cm
area=2×22/7×70(70+2)
=44/7×70(70+2)
=440×72
=31680 cm sq
cost of painting the block at the rate of 1.25 per 100 cm=31680/100×1.25
=39600/100
=396 rupees
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