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The diameter of a penny is approximately 0.75 inches (19.05 millimeters). To convert this measurement to kilometers, we need to first convert inches to meters by multiplying by 0.0254 (since 1 inch is equal to 0.0254 meters). This gives us a diameter of approximately 0.0004826 meters. Finally, to convert meters to kilometers, we divide by 1000, resulting in a diameter of approximately 0.0000004826 kilometers.

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Q: Diameter of a penny in kilometers?
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