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A cylinder has two plane ends. Each plane end is circular, and these two plane ends are parallel to each other.
Also, a cylinder has two dimensions, namely radius and height.
![5.PNG](https://resources.cdn.yaclass.in/3c47e689-ab8d-4bd9-9ff0-57b691ad455a/5w163.png)
The net of a cylinder looks like this.
![6.PNG](https://resources.cdn.yaclass.in/75c7f46b-7371-44a4-bf8f-6e873de17fbc/6w300.png)
\(\text{The total surface area of a cylinder}\) \(=\) \(\text{Area}\) \(1\) \(+\) \(\text{Area}\) \(2\) \(+\) \(\text{Area}\) \(3\)
\(= \pi r^2 + 2\pi rh + \pi r^2\)
[Since \(\text{Area}\) \(1\) and \(\text{Area}\) \(3\) are circles]
\(= 2\pi r^2 + 2\pi rh\)
\(= 2\pi r(r + h)\)
Let us now look at the lateral surface of the cylinder.
![7.PNG](https://resources.cdn.yaclass.in/fc8771be-0292-4832-a489-b58b2055f9d2/7w300.png)
The shaded portion forms the lateral surface of the cylinder.
\(\text{The lateral (or curved) surface area of a cylinder}\) \(=\) \(\text{Area}\) \(2\) \(=\) \(2\pi rh\)