Tangents to the Incircle from a Point on the Circumcircle
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Let M be a point on the circumcircle of a triangle ABC. Let MD and ME be tangents to the incircle and let D and E be the other points of intersection with the circumcircle. Then DE is tangent to the incircle.
Contributed by: Jay Warendorff (March 2011)
Open content licensed under CC BY-NC-SA
"Tangents to the Incircle from a Point on the Circumcircle"
Wolfram Demonstrations Project
Published: March 7 2011