Question

If the daimeter of a solid cylinder with lenght 140cm is 8cm , find its curved surface area ,​

Answer 1

Given:

Diameter of a solid cylinder = 8cm

Length (height) of cylinder = 140 cm

To find:

The curved surface area of the cylinder.

Solution:

We have,

Diameter = 8cm

Radius =
`(8)/(2)=4\text{ cm}`

Height = 140 cm

Curved surface area of a cylinder is

`CSA=2\pi rh`

where, r is radius and h is height.

Putting r=4 and h=140 in the above formula, we get

`CSA=2* (22)/(7)* 4* 140`

`CSA=2* 22* 4* 20`

`CSA=3520`

Therefore, the curved surface area of the cylinder is 3520 square cm.

Answer 2

Answer : The curved surface area of solid cylinder is
`3520cm^2`

Step-by-step explanation :

As we are given that:

Diameter of solid cylinder = 8 cm

Length or Height o solid cylinder = 140 cm

Formula used to calculate the curved surface area of cylinder is:

Curved surface area of cylinder =
`2\pi r* h`

where,

r = radius of cylinder

h = height or length of cylinder

Radius of cylinder =
`(Diameter)/(2)=(8cm)/(2)=4cm`

Now putting all the given values in above formula, we get:

Curved surface area of cylinder =
`2* (22)/(7)* 4cm* 140cm`

Curved surface area of cylinder =
`3520cm^2`

Therefore, the curved surface area of solid cylinder is
`3520cm^2`