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Four circles with radii \(1\)\(2 \)\(3\), and \(r\) are externally tangent to one another, where \(r\) is the smallest radius. Compute \(r\).

 Sep 29, 2020
 #1
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The radius is r = 4/13.

 Sep 29, 2020
 #2
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Can you explain?

Guest Sep 29, 2020

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