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In each example given below, radius of base of a cylinder and its height are given. Then find the curved surface area and total surface area.

i. r = 7 cm, h = 10 cm 

ii. r = 1.4 cm, h = 2.1 cm

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i. Given: r = 7 cm and h = 10 cm 

To find: Curved surface area of cylinder and total surface area

Curved surface area of the cylinder = 2πrh

Total surface area of the cylinder:

The curved surface area of the cylinder is 440 sq.cm and its total surface area is 748 sq.cm.

ii. Given: r = 1.4 cm and h = 2.1 cm 

To find: Curved surface area of cylinder and total surface area

Curved surface area of the cylinder = 2πrh

Total surface area of the cylinder = 2πr (h + r)

∴ The curved surface area of the cylinder is 18.48 sq.cm and its total surface area is 30.80 sq.cm.

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