Q5 of 62 Page 22

A hollow cylindrical pipe is 21 dm long. Its outré and inner diameters are 10 cm and 6 cm respectively. Find the volume of the copper used in making the pipe.

Given,


Length of cylinder = 21 dm = 210 cm


Outer diameter = 10 cm


Outer radius =


Inner diameter = 6 cm


Inner radius =


∴ Area of base =


Volume of cylinder =


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