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A 10 mm diameter object would appear as a circle with a width of 10 millimeters when viewed directly from above. To put it into perspective, a common comparison is that a standard pencil's diameter is around 7-8 mm. So, a 10 mm diameter object would be slightly larger than a pencil's width.
The diameter would be 6.67 mm
Diameter: 24.26 mm Circumference: 76.215 mm
25.5 mm is.
24.26 mm