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Find the volume of a rectangular pipe 1 m long if its outer area of cross section is 4cm×3cm but its internal area of cross section is 3.5cm×2.5cm



Volume of a hollow cuboid=(L-l)(B-b)h
                                          =0.25 cm^{3}
ans. therefore the volume of the hollow cuboid  is 0.25 cm^{3}
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