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Find (i) the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 m in diameter and 4.5 m high.

Q : 9     Find

             (i)  the lateral or curved surface area of a closed cylindrical petrol storage tank that is \small 4.2\hspace{1mm}m in diameter and \small 4.5\hspace{1mm}m high.
 

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Given, a closed cylindrical petrol tank.

The diameter of the tank = \small d = 4.2\hspace{1mm}m

Height of the tank = \small h = 4.5\hspace{1mm}m

We know, 

The lateral surface area of a cylinder of radius \small r and height \small h = \small 2\pi r h

\small \therefore The lateral surface area of a cylindrical tank = \small 2\times\frac{22}{7}\times\frac{4.2}{2}\times4.5

\small \\ = (44 \times 0.3 \times 4.5) \\ = 59.4\ m^2

Therefore, the lateral or curved surface area of a closed cylindrical petrol storage tank is \small 59.4\ m^2

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