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September 20, 2014

September 20, 2014

Posted by **Julia** on Friday, August 14, 2009 at 1:56pm.

- Trigonometric Functions -
**Damon**, Friday, August 14, 2009 at 2:29pmcircumference = 2 pi r = 8 pi

fraction of circumference = 2 pi/8 pi = 1/4

1/4 * 360 = 90 degrees

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