Determine the metal required to make a 21 m long pipe if its inner and outer diameter is 12 m and 10 m respectively ?



Determine the metal required to make a 21 m long pipe if its inner and outer diameter is 12 m and 10 m respectively ?

A. 725 m3

B. 2534 m3

C. 2843 m3

D. 2647 m3

Answer : A. 725 m3


Explanation:


Find the volume with diameter = 12 m


    Radius = Diameter ÷ 2
    Radius = 12 ÷ 2 = 6 m
    Volume = π * r2 * h
    Volume = π * (6)2 * 21
    V1 = 2,375 m3

Find the volume with diameter = 10 m


    Radius = Diameter ÷ 2
    Radius = 10 ÷ 2 = 5 m
    Volume = π * r2 * h
    Volume = π * (5)2 * 21
    V2 = 1650 m3

Find the volume of the metal used:


    Volume = V1 - V2
    = 2,375 - 1650
    Volume = 725 m3


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