I would use kilometers.
The answer will depend on whether you want its perimeter or its area.
I would use a ruler or a tape measure. After I was done, I would express the measurement in centimeters or inches.
If 40 is the measure of one side, the perimeter is 160.
meters
I would use kilometers.
it depends on the shape. the unit should be given
Perimeter is a length or a distance, just like depth, height, and circumference are. Any unit of length can be used to describe a perimeter. Some good ones are ... - nanometer - inch - kilometer - parsec - furlong - yard - league - mile - light-year.
miles or kilometers
The answer will depend on whether you want its perimeter or its area.
I would use a ruler or a tape measure. After I was done, I would express the measurement in centimeters or inches.
A tape measure would be the tool, measuring in centimetres or inches.
If 40 is the measure of one side, the perimeter is 160.
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You would use millimeters (mm) to measure the thickness of a house key, as it is a small unit appropriate for measuring such dimensions.
meters
kilo-newtons.