Two circles with radii a and b respectively touch each other externally. Let c be the radius of a circle that touches these two circles as well as a common tangent to these two circles. Then ___.
(A)
(B)
(C)
(D) None of these
(A)
(B)
(C)
(D) None of these
C is the correct option. The explanation can be found in the following link:
http://www.topperlearning.com/live-chat-with-experts/mathematics/two-circles-with-radii-a-an-10487
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