You can use any you like - it just means there may, or may not, be lots of zeros before, or after, a decimal point.
A sensible unit to use (to avoid lots of zeros and provide a reasonable degree of accuracy) would be millimetres (mm).
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You would typically use the metric unit "kilometers" to measure the distance from home to school.
You would use the unit "meter" in the metric system to measure the distance from point A to point B.
You can use a measuring tape or a laser measuring device to measure the distance to the door in metric units, such as meters or centimeters. Simply extend the measuring tool from your starting point to the door to determine the distance.
The distance between towns is commonly measured in miles or kilometers.
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