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donovanwalker:
The circumference of a circle is 15. Use the formula 646-03-07-00-00_files/i0260000.jpg to find the radius, r. Use 3.14 as an approximation for 646-03-07-00-00_files/i0260001.jpg, and round your answer to the nearest hundredth.
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Vocaloid:
If C = 2pi*r then r = C/(2pi), you are given C = 15 and pi = 3.14, plug these in and solve for r
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