# A Theorem about Two Tangent Circles

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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.

Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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## Details

For more information see Two Touching Circles.

## Permanent Citation

"A Theorem about Two Tangent Circles"

http://demonstrations.wolfram.com/ATheoremAboutTwoTangentCircles/

Wolfram Demonstrations Project

Published: March 7 2011