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  • A hollow cylindrical pipe is 21 m long. It's inner and outer diameter are 10 cm and 16 cm respectively.find the volume of the metal used in making the pipe.

A hollow cylindrical pipe is 21 m long. It's inner and outer diameter are 10 cm and 16 cm respectively.find the volume of the metal used in making the pipe.

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$ Length of the pipe (h)= 21 metres = 2100 cm $ \\ $ Outer Diameter (D)= 16 cm $ \\ $ Inner Diameter (d)= 10 cm $ \\ $ Volume of the metal used $ = \frac{\pi}{4} (D^2 -d^2) \times h\\ =\frac{22}{7 \times 4} (16^2 -10^2) \times 2100\\ =257400 \ cm^3 \\

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Ravindra Pindel

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