There is not really any requirement in length for you to measure in meters. You have to use your own judgement to choose the right unit of measurement.
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your finger nail can be measured in millimeters
If length and width are both measured in meters, then if you multiply them together you will have a square meter. If they are not measured in meters, you will have to convert them to meters first.
they are measured in centimeters.
The mass of objects such as the human body.
Decibels