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They are meters to measure
Metres (in a built-up area), kilometres if across open spaces.
The easiest way is to simply measure across the pool as close to the center line as you can. Also, measure from several different spots to get the closest average. If you need the measurement for around the outside of the pool the you would want to measure the diameter (the distance from one side to the other) as close to the center as you can and multiply that distance (in inches) time 3.1415. For example, if the pool measure 12 feet across (144 inches) then the distance around the pool would be 452.3 inches. The pool liner supplier will most likely just need the diameter and the height of the pool.
metres
a millimetre