A diameter is the length of a chord passing through the center of a circle.
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The diameter of a US nickel is 21.21 millimeters.The united states Nickel has a diameter of 21.21 mm or 2.2121 cm.
US silver dollar coins from 1873 to1978 are 38.1 mm in diameter. In 1979 they were reduced to 26.5 mm in diameter.
Circles have a diameter, not length. The diameter of a US cent is 19 mm.
24.26 mm (0.955 US inches)
Nineteen millimeters.