meters (metres)
Circumference is the measurement around the trunk of the tree. It is usually measured at breast height because trees flare out at the bottom at different rates based on soil conditions. The best way to measure this is with a ribbon or piece of rope. Diameter can be measured by dividing this number by pi or 3.1415
a ruler
measurement
Its best to use a caliper but its fine if you use a cloth tape. Measure 4'6" above the base of the trunk and take your measurement at that point. That is the true caliper of the tree.
The best metric measurement of the mass of a letter would be in grams. This unit of measurement is commonly used to weigh small objects like letters due to its precision and convenience.
The best unit of measurement to measure an alligator is in feet or meters, as these units are commonly used for measuring the length of large animals.
It depends on the size, but if it not that tall use feet, and if it's to hard to measure in feet use yards
height
Feet or metres would seem the most suitable.
Gram.
It depends which property you are measuring.
sign was used in place of measurement.