Posted by James on Friday, March 25, 2011 at 2:44am.
A hollow steel tube, 4 m long, has walls 5 mm thick and is open at each end. if the outer diameter is 41 cm, what's the inner diameter?

math  Jai, Friday, March 25, 2011 at 6:46am
first convert 5 mm to cm
recall that 10 mm = 1 cm
thus 5 mm = 1/2 cm = 0.5 cm
then we subtract the thickness by the outer diameter:
41  2*0.5
41  1 = 40 cm
hope this helps~ :)

math  James, Monday, March 28, 2011 at 12:55am
thanks, it helped a lot

math  Ari, Friday, June 17, 2011 at 7:26am
Work out area and diameter and volume if circumference is 16cm and height 2cm
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