SOLUTION: Four circles of radius r are mutually tangent inside a circle of radius one unit. The radius r is:

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Question 1193107: Four circles of radius r are mutually tangent inside a circle of radius one unit. The radius r is:
Answer by ikleyn(52803) About Me  (Show Source):
You can put this solution on YOUR website!
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Could you provide a picture/figure or a reference ?

I doubt that such configuration is possible . . .