Given: For cylindrical container: diameter (d) = 28 cm, height (h1) = 20 cm
For cylindrical lid: height (h2) = 2 cm
diameter (d) = 28 cm
∴ radius (r) = d/2 = 28/2 = 14 cm
i. Surface area of the cylinder with one side open = Curved surface area + Area of a base
= 2πrh1 + πr2
= πr (2h1 + r) = (22/7) x 14 x (2 x 20 + 14)
= 22 x 2 x (40 + 14)
= 22 x 2 x 54
= 2376 sq.cm
ii. Area of sheet required to made a lid = Curved surface area of lid + Area of upper surface
= 2πrh + πr2 = πr (2h + r)
= (22/7) x 14 x (2 x 2 + 14)
= 22 x 2 x (4 + 14)
= 22 x 2 x 18
= 792 sq cm
∴ The area of the sheet required to make the cylindrical container is 2376 sq. cm and the approximate area of a sheet required to make the lid is 792 sq. cm.