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Can you find the outer and inner radii of the tube ?

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The difference between outside and inside surface areas of a tube 28 cm long in 88 cm^2 .
The total surface area of the tube is 1254 cm^2 .
Can you find the outer and inner radii of the tube ?

posted Jan 7, 2016 by Varun Kumar

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1 Answer

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Tube=Hollow cylinder
Outer area=A1 , Inner area=A2
A1+A2=1254cm^2.................(i)
A1-A2=88cm^2.......................(ii)
simplify (i) & (ii)
A1=671cm^2
A2=583cm^2
h=28cm

A1=2piR1h
A2=2piR2h
Therefore
R1=outer radii=3.813cm
R2=inner radii=3.313cm

answer Jan 7, 2016 by Jaikumar Bhatia



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