A hollow cylindrical pipe 21 dm long is made of copper. Its outer and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making the pipe.
Let h = height of the pipe = 21 dm = 210 cm
R = External Radius =
r = Internal Radius =
Volume of copper used in making the pipe
= Volume of External cylinder - Volume of Internal cylinder
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