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A Theorem about Two Tangent Circles

​
blue circle radius
slope(AB)
≈
3.13
slope(DC)
≈
3.13
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.

Details

For more information see Two Touching Circles.

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