The diagonals and the lines joining opposite contact-points, in a circumscriptible to a conic quadrilateral, pass all through a common point E. Look at Brianchon.html for the proof in the case of circles.

The lines joining a vertex with the contact point of the opposite side of a triangle circumscribed to a conic pass all through a common point E. This is a basic property of this kind of conics and E is called the

Brianchon2.html

CircumscriptibleQuadrilateral.html

Pascal.html

TriangleConics.html

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