MBA
Exam
A circle centered at A with a radius of 1,
and a circle centered at B with a radius of 4, touch each other
externally. A third circle is tangent to the first two circles and to
one of their common external tangents as shown. The radius of the third
circle is 1) 2/9 2) 5/9 3) 11/25 4) 4/9
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