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**Find**

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.

`["Assume "pi=22/7]`

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#### Solution

Height (h) of cylindrical tank = 4.5 m

Radius (r) of the circular end of cylindrical tank = (4.2/2)m = 2.1m

Lateral or curved surface area of tank = 2πrh

`=(2xx22/7xx2.1xx4.5)m^2`

= (44 × 0.3 × 4.5) m^{2}

= 59.4 m^{2}

Therefore, CSA of tank is 59.4 m^{2}.

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