Tangent Circles and Parallel Diameters

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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 (March 2011)
After work by: Antonio Gutierrez
Open content licensed under CC BY-NC-SA


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



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