Question

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

r = 7 cm, h = 10 cm

Answer 1

We know that,

Curved surface area = 2πrh

Total surface area = 2πr(h + r)

Here, r = 7 cm, h = 10 cm

The curved surface area of a cylinder = 2πrh

= `2 xx 22/7 xx 7 xx 10`

= `44 xx 10`

= 440 cm²

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

= `2 xx 22/7 xx 7(10 + 7)`

= `44 xx 17`

= 748 cm²