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A Theorem about Two Tangent Circles

Let A and C be the centers of two tangent circles. Draw a line from a point E through the intersection of the two circles and let that line intersect the circles at B and D. Then AB is parallel to CD.

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For more information see Two Touching Circles.

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"A Theorem about Two Tangent Circles" from the Wolfram Demonstrations Project
 http://demonstrations.wolfram.com/ATheoremAboutTwoTangentCircles/
Contributed by: Jay Warendorff
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