Question

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

Answer 1

Volume of a hollow cuboid=(L-l)(B-b)h
                                          =(4-3.5)(3-2.5)*1
                                          =0.5*0.5
                                          =0.25$cm^{3}$
ans. therefore the volume of the hollow cuboid  is 0.25$cm^{3}$

Answer 2

Answer:

$325 cm^3$

Step-by-step explanation:

Height of the pipe = 1 m = 100 cm

Outer length = 4 cm

Outer breadth = 3 cm

Inner length = 3.5 cm

Inner breadth = 2.5 cm

Volume of pipe = Outer volume - Inner volume

                         =$(4 \times 3 \times 100)-(3.5 \times 2.5 \times 100)$

                        =$325 cm^3$

Hence the volume of pipe is $325 cm^3$