2.12 cm (or 21.2 mm)
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A US nickel coin has a diameter of 2.121 cm and its thickness is 0.195 cm
A US nickel has a diameter of 2.121 cm. Because it's a circle it doesn't have a length.
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.
2.12 cm (or 21.2 mm)
The diameter of a US nickel is 0.835 inches.