40 centimetres is greater than 40 millimetres.
Note, there are 10 millimetres to 1 centimetre.
Therefore, 40 millimetres only measures 4 centimetres.
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40cm
6.4 metres as .4 means 40cm
1 decimeter is 10cm, so 4 is 40cm, greater than for 4cm
40cm
circumference = pi*40cm