# Tangent Spheres and Triangle Centers

@article{Eppstein2001TangentSA, title={Tangent Spheres and Triangle Centers}, author={D. Eppstein}, journal={Am. Math. Mon.}, year={2001}, volume={108}, pages={63-66} }

Any four mutually tangent spheres in R^3 determine three coincident lines through opposite pairs of tangencies. As a consequence, we define two new triangle centers.

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