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Posted by **daisy** on Tuesday, March 1, 2011 at 8:33pm.

- math -
**MathMate**, Tuesday, March 1, 2011 at 10:02pmCircumference

= 2πr

= 2*3.14159*8.2 (mm, I suppose)

= 51.522 mm

= 51.5 mm (rounded to the nearest 1/10th)

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