# 1]A contractor agrees to dig a basement 8mx6mx3m.How many cubic meters of earth will be taken out? 2]A rectangular sheet of paper of dimensions 25cmx14cm is revolved along its width to form a cylinder.Find the volume of the cylinder so formed. 3]A HOLLOW CYLINDRICAL PIPE IS 1.4m long.Its outer and inner diameters are cm and cm respectively.Find the volume of the metal used in making pipe.

1
by Deleted account
third question - what are the diameters?
12cm and 10cm

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2015-02-01T15:18:48+05:30

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1. The earth to be taken out = volume of the basement = 8×6×3 = 144m³

2. length of sheet = 25cm
width of sheet = 14 cm
if it is revolved along its width to form a cylinder,
height = length of sheet = 25cm
perimeter = width of sheet = 14 cm

3.length = 1.4 m = 140cm
inner diameter()=10cm
inner radius() = 10/2 = 5 cm
outer diameter()=12cm
outer radius() = 12/2 = 6 cm

Volume of metal used = volume of outer cylinder - volume of inner cylinder

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thank you!:)
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