A cylindrical pipe open at both ends is made up of 2cm thick plastic.If the external diameter is 42 cm and the lengthof tube is 140 cm
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Internal diameter =11.2cm=11.2cm
Internal radius =11.22=11.22
=5.6m=5.6m
Length of the tube =21cm=21cm
Volume of the internal cylinder =πr2h=πr2h
=22×5.6×5.6×217=22×5.6×5.6×217
=2069.76cm2=2069.76cm2
External radius =R=(5.6+0.4)=R=(5.6+0.4)
Volume of the external cylinder =πR2h=πR2h
=22×6×6×217=22×6×6×217
=2376cm2=2376cm2
Volume of the metal = volume of external diameter - volume of internal diameter
=(2376−2069.76)=(2376−2069.76)
=306.24cm3=306.2cm3=306.24cm3=306.2cm3
Answer : 306.2cm2
Internal radius =11.22=11.22
=5.6m=5.6m
Length of the tube =21cm=21cm
Volume of the internal cylinder =πr2h=πr2h
=22×5.6×5.6×217=22×5.6×5.6×217
=2069.76cm2=2069.76cm2
External radius =R=(5.6+0.4)=R=(5.6+0.4)
Volume of the external cylinder =πR2h=πR2h
=22×6×6×217=22×6×6×217
=2376cm2=2376cm2
Volume of the metal = volume of external diameter - volume of internal diameter
=(2376−2069.76)=(2376−2069.76)
=306.24cm3=306.2cm3=306.24cm3=306.2cm3
Answer : 306.2cm2
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