# 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.

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Contributed by: Jay Warendorff (March 2011)

Open content licensed under CC BY-NC-SA

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detailSectionParagraph## Permanent Citation

"Secant Intersection with Two Internally Tangent Circles"

http://demonstrations.wolfram.com/SecantIntersectionWithTwoInternallyTangentCircles/

Wolfram Demonstrations Project

Published: March 7 2011