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The diameter of a nickel is 2.121 cm.

To find the perimeter of the nickel, we will use the equation 2(Pi)r

To find the radius, r, divide the diameter by 2.

2.121/2=1.0605

P = 2(3.14159)(1.0605)

= 6.6633 cm

Therefore, the perimeter of a nickel is approximately 6.66 cm.

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Q: How many centimeters round is a nickel?
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