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Tangent Circles and Parallel Diameters


	Let two circles with diameters BC and DE be tangent at point A. If BC \|\| DE, then A, C, and E are collinear.


	Contributed by: Jay Warendorff After work by: Antonio Gutierrez

The statement of the theorem is in Archimedes Book of Lemmas: Proposition 1.

Collinear (Wolfram MathWorld)

Parallel (Wolfram MathWorld)

Tangent Circles (Wolfram MathWorld)

"Tangent Circles and Parallel Diameters" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TangentCirclesAndParallelDiameters/

Contributed by: Jay Warendorff

After work by: Antonio Gutierrez

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