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.
Which dimensions are which? For a base of 2 cm, height of 3 cm, and length of 2 cm it would be 5 cm^3. It would be the same if the base were 3 cm, but if the length were 3 cm it would instead be 6 cm^3.