Question

A pillar is in the shape of a cylinder has radius 21cm and height 3m. Find its curved surface area.​

Answer 1

Answer:

Area is equal to 4.24m²

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Answer 2

Given: A pillar is in the shape of a cylinder has radius 21 cm and height 3 m.

To find: The curved surface area.​

Solution:

In order to calculate the curved surface area of a cylinder, the following formula can be used.

$CSA = 2\pi rh$

Here, r is the radius of the cylinder and h is the height of the cylinder. The radius of the cylinder is given as 21 cm which is equal to 0.21m.

Now, the values of r and h that are given in the question are substituted in the equation and the value of the curved surface area of the cylinder is found.

$CSA = 2*\frac{22}{7} *0.21 *3$

        $= 39.6 m^{2}$

Therefore, the curved surface area is 39.6 m².