Cópia de Dandelin's theorem

Author:Eliesio A. Silva, Mathieu Blossier

* Move points A and B to change section of the cone * Spheres are tangent to the plane and to the cone * Move point P on the conic * When the conic is an ellipse, why is MP+PH constant ?

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C&oacute;pia de Dandelin's theorem

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