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?


Height (h) of cylindrical tank = 1 m

Base radius (r) of cylindrical tank = () cm


= 70 cm


= 0.7 m


Area of sheet required = Total surface area of tank


= 2r (r + h)


= [2 * * 0.7 (0.7 + 1)] m2


= (4.4 * 1.7) m2


= 7.48 m2


2
1