The circumference of a circle compared to the radius
The circumference of a circle is a little more than 6 times the length of the radius.
Source
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"Algebra and Trigonometry, Algebra and Trigonometry.."
http://cnx.org/contents/13ac107a-f15f-49d2-97e8-60ab2e3b519c@5.241
OpenStax
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