The first line of your index finger.
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2.5 cm looks like about 1 inch on a ruler
unit of measurement. Look at ruler and take an inch and divide by 4 equal parts. Each has a mark, one of those is 1/4 (quarter) 2 a half (1/2), 3 is 3/4 and 4 makes 1 whole inch. Just like a quarter (money) is one fourth of a dollar (whole)
There are one thousand thousandths of an inch in one inch.
Two-thirds of one inch is 2/3 of an inch.
One, if the unit is an inch!