30.5 cm = 30.5 centimetres, because cm is only the short way way to say centimetres.
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Area = 9 cm * 4 cm = 36 square cm
1 cm = 1 cm 100 cm = 1m 1 cm = .01 m
12 cm x 6 cm x 4 cm= 288 cm
3 cm is 1 cm less than 4 cm.
1.1 cm by 1.8 cm is 1.1 cm x 1.8 cm = 1.98 cm2