find the lateral surface .Area of a cylinder petrol storage tank that is 4.2min diameter and 4.5m in height .how much Steel was actually used if 1/10 of steel actually used was wasted in making the close tank
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4.2 diameter 4.5height
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Answer:
(a)
d = 4.2
r = 4.2/2 =2.1 m
h = 4.5 m
lateral surface area of cylinder petrol tank = 2πrh
= 2 * 22/7 * 2.1 * 4.5
= 59.4 m^2
(b)
total surface area of the closed cylindrical petrol storage tank
= 2πr (r + h)
=2 x 22/7 x 2.1x (4.5m + 2.1m)
= 87.12 m^2
Area of steel wasted in making the tank
= (1 / 10) x Total surface area
= (1 / 10) x 87.12 m^2
= 8.712m^2
Actual area of the steel used for making the tank.
= Total surface of the tank + Area of steel wasted in making the tank
= 87.12 m^2 + 8.712 m^2
=95.832 m^2
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