Degenerate case of a theorem of Pascal

作者：msa

If ABC is a triangle, and P, Q and R are the intersections of the tangents to the circumcircle at the vertices with their opposite sides, then P, Q, and R are collinear.

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S.5 Ch.11 Basic properties of Circles (II)
Teste
Optelling van Heelgetalle
Untitled
Solving Quadratic Equations by Reasoning: IM Alg1.7.3

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3D 向量（三維）
Dilation
垂心
等式
餘弦

Degenerate case of a theorem of Pascal

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