Analytic geometry, for technical schools and colleges (1897)
Lambert, Preston Albert, 1862-1925 · New York, Macmillan · leaf 136
122 ANALYTIC GEOMETRY sects the major axis in the foci. The directrix is perpendicularto the line of foci where the focal tangents cross this line. In the case of the hyperbola the directions of the axes arefound as for the ellipse. The focus is determined by drawinga perpendicular to any tangent…
Geometry, Analytic
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