Geometric Solid

A concrete pipe is 1.0 m long. Its inside and outside diameters are 60 cm and 75 cm, respectively.

What is the volume of concrete (in cubic meters) needed to make 25 pieces of pipe?

Correct answer:

V =  3.98 m3

Step-by-step explanation:

L=1.0 m d=60 cm m=60:100  m=0.6 m D=75 cm m=75:100  m=0.75 m n=25  S1=π (D/2)2=3.1416 (0.75/2)20.4418 m2 S2=π (d/2)2=3.1416 (0.6/2)20.2827 m2  S=S1S2=0.44180.28270.159 m2  V1=S L=0.159 10.159 m3  V=n V1=25 0.159=3.98 m3



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