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September 20, 2014

September 20, 2014

Posted by **alisa** on Monday, November 14, 2011 at 7:14pm.

- geometry -
**Reiny**, Monday, November 14, 2011 at 7:50pmlet the number of sides be n

180(n-2)/n = 140

180n - 360 = 140n

40n = 360

n = 9

9-sided regular polygon, a nonagon

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