Question 1093913
.
This problem is solved in the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/Polygons/The-side-length-of-a-regular-polygon-via-the-radius-of-the-circumscribed-circle.lesson>The side length of a regular polygon via the radius of the circumscribed circle</A>  
in this site (Problem 1).



Also, &nbsp;you have this free of charge online textbook on Geometry

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/Triangles/GEOMETRY-your-online-textbook.lesson>GEOMETRY - YOUR ONLINE TEXTBOOK</A> 

in this site.


The referred lesson is the part of this online textbook under the topic &nbsp;"<U>Properties of polygons</U>".