lots of circles
Two circles with radii r and 2r respectively touch each other externally. The radius of a circle that touches these two circles as well as a common tangents to the two circles, will be of the form (a/b +a sqrt(a))r. find a+b.
note:-the equation editor was not working properly.
Please add a nice solution. I cannot as I dont know ho to use LaTeX.
The answer is 5.
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