A metallic pipe whose eternal and external diameters are 8cm and 6cm has a length of 2.1m. Find the volume of the pillar.
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the volume of the cylinder= πh(R-r)^2
=22/7 * 2.1* (4-3=)^2
=6.6 cm^3
=22/7 * 2.1* (4-3=)^2
=6.6 cm^3
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