# Curved Surface Area of Cylinder: Formula, Examples

Cylinders are three-dimensional shapes with real-world uses such as soup cans and pipes. Moreover, understanding the surface area of a cylinder is required for different purposes. One example would be estimating the paint needed or calculating the material required to create a cylindrical object. Additionally, this blog tells you about the concept of the Curved Surface Area of a Cylinder, the formula and examples.

Also Read: Surface Areas and Volumes

## What is the Formula for the Curved Surface Area of a Cylinder?

If you unroll the Curved surface of a cylinder it will change into a flat rectangle. Additionally, the length of this rectangle is equal to the cylinder’s circumference, which is 2πr (where r is the base radius and π is pi). Moreover, the height of the rectangle stays the same as the cylinder’s height (h).

Therefore, the formula for the Curved surface area of a cylinder (CSA) is:

CSA = 2πrh

Here,

• CSA represents the Curved surface area.
• π (pi) is a mathematical constant with an approximate value of 3.14.
• r represents the base radius of the cylinder.
• h represents the height of the cylinder.

## Curved Surface Area of Cylinder Example

Let us say you have a tin can with a base radius of 5 centimetres and a height of 10 centimetres. You want to find the Curved surface area (the area excluding the top and bottom circles) needed to wrap a creative label around the can.

Using the formula CSA = 2πrh:

• CSA = 2 ✕ 3.14 ✕ 5 ✕ 10 (assuming the value of π as 3.14)
• CSA = 314 cm²

Thus, you will need approximately 314 square centimetres of material for your creative label.

Take a look at another example. The radius is 3 meters and the height is 8 meters. Again we shall take the Formula, CSA = 2πrh.

• 2 ✕ 3.14 ✕ 3 ✕ 8 (assuming the value of π as 3.14)
• CSA = 150 m²

Therefore, with the radius being 3 meters and the height being 8 meters, the CSA is 150 m².

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