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Three circles, two with radius R and one with radius r, are drawn on the same side of a straight line in such a way that each circle is tangent to the line and both other circles. What is the relationship between R and r?
"Three circles, two with radius R and one with radius r, are drawn on the same side of a straight line in such a way that each circle is tangent to the line and both other circles. What is the relationship between R and r?"