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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 1 /12 of the steel actually used was wasted in making the tank. *

Respuesta :

sqdancefan

Answer:

  (i) 59.38 m^2

  (ii) 64.77 m^2

Explanation:

(i)

The lateral area of a cylinder is ...

  A = πdh

  A = π(4.2 m)(4.5 m) = 18.9π m^2 ≈ 59.38 m^2 . . . tank wall area

__

(ii)

If that represents 11/12 of the steel used, then the steel used is ...

  (12/11)(59.38 m^2) ≈ 64.77 m^2 . . . steel used

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