I would use kilometers.
Chat with our AI personalities
Metre.
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.
You, add S1+S2+S3+S4=7+7+2+2= 18with the unit of measure so like inches it would be18infeet18ft18m18km