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.
(ii) how much steel was actually used, if
of the steel actually used was wasted in making the tank.
Solution (i)
Diameter of cylindrical petrol storage tank
m
Radius of cylindrical petrol storage tank
m
Height of cylindrical petrol storage tank
m
Curved Surface Area of cylindrical petrol storage tank
Solution (ii)
Let total steel used
It is given that
th of steel was wasted in making the tank.
Therefore,
is the amount of steel wasted.
Total Surface area of cylindrical petrol storage tank
According to the given condition, we will have
Total surface area of cylindrical petrol storage tank
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