A hollow cylinderical metallic pipe is 21 cm long. If the external and internal diameter of the pipe are 12 cm and 8 cm respectively. find the volume of metal used in making the pipe.
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Answer:
Step-by-step explanation:
Find the volume with diameter = 6 cm
Radius = Diameter ÷ 2
Radius = 6 ÷ 2 = 3 cm
Volume = πr²h
Volume = π(3)²(21) = 594 cm³
Find the volume with diameter = 10 cm
Radius = Diameter ÷ 2
Radius = 10 ÷ 2 = 5 cm
Volume = πr²h
Volume = π(5)²(21) = 1650 cm³
Find the volume of the metal used:
Volume = 1650 - 594 = 1056 cm³
Answer: The volume of the metal used is 1056 cm³
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