Secant Intersection with Two Internally Tangent Circles
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If two circles are internally tangent at point A and a secant intersects the circles at B, C, D, and E, then BAD =
CAE.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
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"Secant Intersection with Two Internally Tangent Circles"
http://demonstrations.wolfram.com/SecantIntersectionWithTwoInternallyTangentCircles/
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Published: March 7 2011