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Two circle of radii R and r ,R > r touch...

Two circle of radii `R` and `r ,R > r` touch each other externally then the radius of circle which touches both of them externally and also their direct common tangent, is `R` (b) `(R r)/(R+r)` `(R r)/((sqrt(R)+sqrt(r))^2)` (d) `(R r)/((sqrt(R)-sqrt(r))^2)`

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