Syllabus of Elementary Geometrical Conics (Classic Reprint) - Softcover

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Excerpt from Syllabus of Elementary Geometrical Conics

If the tangent at P meets the directrix in Z, psz is a right angle, and the tangent at P bisects the angle between the focal distance SP and the perpendicular PM on the directrix: and the tangent at the vertex is at right angles to the axis.

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