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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