Line through intersections of common tangents to circles

Thème :Cercle, Géometrie, Droite Tangente ou Tangente

Theorem: Let be given 3 circles, and the 3 pairs on external common tangents to circles. These pairs intersect at 3 collinear points. You are invited to play with this configuration.

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巧算長方形周界
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Ray Function
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Moyenne Géométrique
Probabilité