US nickels have a diameter of 0.835 inches and a thickness of 0.077 inches.
However, coin dimensions are normally measured in millimeters so those numbers are 21.2 mm by 1.95 mm.
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The diameter of a US nickel is 0.835 inches.
US coins are normally measured in metric units. A nickel is 21.21 mm in diameter and there are 25.4 mm in an inch, so the diameter in inches would be 21.21/25.4 = 0.835 inches
US coins are normally measured in metric units. A nickel is 21.21 mm in diameter. The radius is half the diameter, and there are 25.4 mm in an inch to the radius in inches would be 0.5 x 21.21 / 25.4 = 0.417 inches
A US nickel has a diameter of 2.121 cm. Because it's a circle it doesn't have a length.
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