A section of concrete pipe 30 m long has an inside diameter of 1.2 m and an outside diameter of 1.8 m. What is the volume of concrete in this section of pipe
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Hey dear!
Here is yr answer......
Length = 30m
inner diameter = 1.2
r2 = 1.2/2 = 0.6
Outer diameter = 1.8
r1 = 1.8/2 = 0.9
Volume of section of concrete pipe ---
= πr2²h - πr1²h
= πh (r2²-r1²)
= 22/7 × 30(0.9² - 0.6²)
= 660/7 (0.81-0.36)
= 660/7 (0.45)
= 42.42m³
Hope it hlpz....
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