My Math Forum Circumscribed circle to tangent circles

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 May 5th, 2015, 01:47 PM #1 Newbie   Joined: May 2015 From: Brazil Posts: 3 Thanks: 0 Circumscribed circle to tangent circles Hy guys, Need some help to solve this problem. I have a geometrical arrangement with 2 kinds of circles. Circle A has radius Ra and B has radius Rb. The number of circles A is na and the number of circles B is nb. It's also known that all circles are tangent Like the picture below. I'd like to determine the Radius of the Circumscribed circle to this arrangement, R, as a function of Ra, Rb, na and nb. Mathissue.jpg Any help appreciated!

 Tags circle, circles, circumscribed, tangent

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