2.21cm
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No.
2.1 metres is one possible answer.
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There are 2 significant figures in this measurement.
9 cm
Neither - they are the same measurement.
It's a measurement of length which is half a centimeter. It's equal to 5 millimeters and is roughly .197 inches.
Well, sweetheart, you can't convert centimeters to cubic centimeters because they're not the same thing. Centimeters measure length, while cubic centimeters measure volume. It's like trying to compare apples to oranges - they're just not the same. So, in short, you can't convert cm to cm3 because they're two different animals.