9. Find 1. The total surface area of a closed cylindrical petrol storage tank who whose diameter 4.2 m. and height 4.5 m. 2. How much steel sheet was actually used, if 1/12 of the steel was wasted in the tank.
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Answer:
HELLO THIS YOUR ANSWER
Step-by-step explanation:
Given
Diameter of the cylinders=4.2m
∴ Radius of the cylinders, r =
2
4.2
=2.1m
Height of the cylinders, h=4.5m
Thus, the total surface area of the closed cylindrical
petrol tank=2πrh+2πr
2
=2π(2.1)(4.5)+2.π(2.1)
2
=2.
7
22
×2.1×4.5+2×
7
22
×2.1×2.1[π=
7
22
]
=59.4+27.72
=87.12m
2
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