

Lemoine Line Theorem: Triangle, Circumcircle, Tangent,
Vertices, Collinear Points. Level: High School, College.
Stepbystep illustration.
To start: click Next button. Next screen: Next button
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Tangents to the circumcircle of
triangle ABC, at points A, B, and C, meet sides BC, AC, and BA at
points D, E, and F respectively. Prove that point D, E, and F
are collinear. Click the Next button
above to start the stepbystep illustration.







