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I'm developing a mathematical formula for a programming interface. Please see following image for description: enter image description here

As you will see in the diagram, I have variables that will be set by my software( a, d and x), but I need a function to calculate the radius of the big circle ( r ). I can't think of any solution and I don t really need an exact one, approximation will work (rounded up even better) if there isn't any solution.

Any help will be much appreciated.

  • 1
    Is the black circle supposed to pass through the center of each small circle?2012-04-16
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    yes, the center of the small circles is for sure on the perimeter of the big circle.2012-04-16

2 Answers 2