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?

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  1. 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~ :)

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  2. thanks, it helped a lot

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  3. Work out area and diameter and volume if circumference is 16cm and height 2cm

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