Geometry
posted by mary .
Problem : Howm do you find the area of a circle circumscribed about a regular pentagon with a perimeter of 50 inches.
So far I each side of pentagon is 10. How do I find the radius of the circle? Is this the correct direction to go?

Geometry 
bobpursley
Ahh the golden ratio, and now you will know why followers of Pythagoras used the pentagon as a secret symbol: it harbors secret numbers.
http://www.treenshop.com/Treenshop/ArticlesPages/FiguresOfInterest_Article/The%20Regular%20Pentagon.htm
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