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The USA 25 cents (quarter) coin is ø 24.26 mm
The diameter of a quarter is 24.26 mm. Circumference is pi* diameter. 24.26 mm * 3.14159=76.21 mm
There is no specific name. A quarter of a mm could also be known as 250 micrometres and so on.
US coins: Cent - 19.05 mm Nickel - 21.2 mm Dime - 17.9 mm Quarter - 24.3 mm Half - 30.1 mm Dollar (modern) - 26.5 mm
25*10 = 250 mm