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A US 5 cent coin (a nickel) has a diameter of 21.21 mm -. That is 2.121 cm
A US nickel coin has a diameter of 2.121 cm and its thickness is 0.195 cm
A nickel has a width/diameter of 21.21mm (2.121cm) and a thickness of 1.95mm (0.195cm).
2.12 cm (or 21.2 mm)
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.