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Lemoine Line Theorem: Triangle, Circumcircle, Tangent, Vertices, Collinear Points. Level: High School, College. Step-by-step illustration.

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Lemoine line theorem

 

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 step-by-step illustration.

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