I would use Meters
Meters
To measure the height of a flagpole. you would use the Meter.
metres and centimetres
55 feet
Inch
meters
Mile
Foot
Meter
meters
A door is about 2 meters, but most likely you'd measure in centimeters.
While the dog is standing up on all fours, measure from the floor to the top of the shoulder.
milimetersMilliliter
kilometers
You would have to be able to get to the top of the flagpole, so I would say that the answer is "with some difficulty". It also depends on characteristic (mass, volume, radius, height) what you wished to measure.
You would use meters.
meters
Meters.
6 m would be used to measure flagpole. 600 m is a bigger unit.
A door is about 2 meters, but most likely you'd measure in centimeters.
Metres (American spelling = meters), unit symbol "m", would be the most appropriate metric unit to measure the height of a 32-story building.
If you mean measure height then it would be the metre if you mean measure weight it would be Kilograms
millimetres (centimetres could also be used)
The height of a building is measured in metres.
While the dog is standing up on all fours, measure from the floor to the top of the shoulder.
Metre to measure its length. Possibly centimetres to measure its height if a garden fence but metres if a security fence.