Maths-
General
Easy
Question
Calculate the volume of the metal pipe whose inside diameter is 6 cm and whose outside diameter is 8 cm, if it is 20 cm long.
Hint:
A pipe is typical hollow cylinder shaped. Subtracting the volume with inside diameter from the volume with outside diameter, we will get the volume of metal.
The correct answer is: The volume of metal is 440 cm3.
Explanations:
Step 1 of 2:
Inside diameter = 6 cm; therefore, inside radius, r = 6/2 = 3 cm
Outside diameter = 8 cm; therefore, outside radius, R = 8/2 = 4 cm
The length of the pipe is, h = 20 cm
Volume with inside radius =
cm3
Volume with outside radius = 
cm3
Step 2 of 2:
Volume of metal = volume with outside radius – volume with inside radius
cm3
Final Answer:
The volume of metal is 440 cm3.
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