Question

Find,the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 metre in diameter and 4.5 metre high, how much Steel was actually used if 1 upon 12 of the Steel actually used was wasted in making the tank.

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Answer 1

Question:

Find,the lateral or curved surface area of a closed cylindrical petrol storage tank that is 4.2 metre in diameter and 4.5 metre high, how much Steel was actually used if 1 upon 12 of the Steel actually used was wasted in making the tank.

Answer:

Given: Tank Diameter = 4.2 m

Radius =

$\frac{4.2}{2}=2.1$

Height of the tank = 4.5 m

Formula: Curved surface area of the cylinder = 2πrh = 2 x π x 2.1 x 4.5=

$2\times2.1\times$

4.5= 59.4 m²

Steel was actually used =

$\frac{1}{12}x 59.4 ⇒ 4.95$

Therefore, steel actually use was wasted in making the tank = 59.4 - 4.95 = 54.45 m.