Dynamic Geometry

Given three disjoint circles A, B and C of unequal radii situated entirely in each other's exterior, the common internal tangents of circles A and C meet in Y, the common internal tangents of circles A and B meet in Z and the common external tangents of circles B and C meet in X. Then the points X, Y and Z are collinear.

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## Wednesday, December 3, 2008

### Monge & d'Alembert Three Circles Theorem II

Labels:
circle,
collinear,
dynamic geometry,
Monge d'Alembert theorem

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