30 cm (30 centimters) is 3/100 of a meter, or 300 millimeters, about equal to a foot in length.
(30 cm = 0.984 ft)
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30 mm is only 3 cm
First impression is that it is a big block with dimensions in cm. But if that's the case it ought to say cm3 , or 53cm x 30cm x 37cm. Strictly as written it means 53x30x37cm = a length 58830 cm
pi*30 cm
30 feet = 914.4 cm
I do not understand why I appear in the question! Anyway, 30 cm / 1 m = 30 cm/100 cm = 3/10