Posted by **Jerico** on Thursday, May 23, 2013 at 9:35pm.

How do I find the radius of a regular nonagon with an apothem of length 6.42in.

- Math (geometry) -
**Steve**, Friday, May 24, 2013 at 11:25am
There are 9 40° angles in a circle, so the nonagon consists of 9 isosceles triangles, having angles of 40,70,70.

The radius is r, where

6.42/r = cos20°

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