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प्रश्न
It is required to make a closed cylindrical tank of height 1 m and base diameter 140 cm from a metal sheet. How many square meters of the sheet are required for the same?
`["Assume "pi=22/7]`
उत्तर
Height (h) of cylindrical tank = 1 m
Base radius (r) of cylindrical tank = (140/2)cm = 70cm = 0.7m
`"Area of sheet required = Total surface area of tank "=2pir(r + h)`
`= [2xx22/7xx0.7(0.7+1)]m^2`
`= (4.4xx1.7)m^2`
`= 7.48m^2`
Therefore, it will require 7.48 m2 area of sheet.
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