A closed cylindrical water tank is made from a plastic sheet.Its diameter is 1.4m and the height is 3.5m.Find the actual area of the plastic sheet used, if 1/3of the sheet actually used was waisted in making the water tank.(take pie 22/7)

the diameter of the cylindrical tank = 1.4 m 

height of the tank h = 3.5 m

the radius of the base of the cylindrical tank r = 1.4/2 = 0.7 m

the  total surface area of the cylindrical tank = curved surface area + 2* area of the base


the waisted sheet =

the total plastic sheet = 18.48+6.16 = 24.64 sq cm

hope this helps you.

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