The total surface area of a closed cylindrical petrol storage tank whose diameter 4.2 and height 4.5 meters
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Diameter of a closed cylindrical petrol tank =4.2m
Radius of it=4.2m÷2=2.1m
Height of it =4.5m
Therefore,area of it =pie (3.14)×radius square m×height
= 3.14×2.1×2.1×4.5
=62.37 square m
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