English: Two fixed points, a circle, and ellipses with the fixed points as foci, the ellipse in red is tangent to the circle. Drawn in GeoGebra to be used in Alhazen's problem article.
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Captions
Two fixed points, a circle, and ellipses with the fixed points as foci, the ellipse in red is tangent to the circle. Used in Alhazen's problem article.