9. Find(1) The total surface area of a closed cylindrical petrol stora

1.	9. Find(1) The total surface area of a closed cylindrical petrol storage tank whose diameter4.2 m and height 4.5 m.(i) How much steel sheet was actually used,if 1/12 of the steel was wasted in making the tank.
Answer» ANSWER: 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

9. Find(1) The total surface area of a closed cylindrical petrol storage tank whose diameter4.2 m and height 4.5 m.(i) How much steel sheet was actually used,if 1/12 of the steel was wasted in making the tank.

Answer»

ANSWER:

GIVEN

Diameter of the cylinders=4.2m

∴ RADIUS of the cylinders, R =

4.2

=2.1m

Height of the cylinders, h=4.5m

Thus, the total surface area of the closed cylindrical

petrol tank=2πrh+2πr

=2π(2.1)(4.5)+2.π(2.1)

=2.

×2.1×4.5+2×

×2.1×2.1[π=

]

=59.4+27.72

=87.12m

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9. Find(1) The total surface area of a closed cylindrical petrol storage tank whose diameter4.2 m and height 4.5 m.(i) How much steel sheet was actually used,if 1/12 of the steel was wasted in making the tank.​

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9. Find(1) The total surface area of a closed cylindrical petrol storage tank whose diameter4.2 m and height 4.5 m.(i) How much steel sheet was actually used,if 1/12 of the steel was wasted in making the tank.