Cone Intersected by a Plane to Form a Parabola

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Diagram of a cone intersected by plane J to form a parabola. Also pictured is a circle formed by the intersection of plane K with the cone. “Every point of a parabola is equidistant from the focus and the directrix.”


Arthur Latham Baker The Elements of Solid Geometr with Numerous Exercises (Boston, MA: Ginn & Company, 1893)


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