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1 inch equals 25.4 millimeters or 2.54 centimeters or 0.0254 meters or 0.0000254 kilometers

It's about the diameter of a US quarter dollar coin.

2.5 cm

Your thumbnail, or a hairpin.

Originally IT WAS BASED on the length of an English King's thumbnail. This is absolutely true.

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13y ago
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Q: How long is an inch?
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