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The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners (1903)

Briggs, George R. (George Russell), b. 1853, Bôcher, Maxime, 1867-1918 · New York, J. Wiley & sons; [etc., etc.] · leaf 124

An illustration from The elements of plane analytic geometry. A text-book including numerous examples and applications, and especially designed for beginners, 1903, leaf 124
e called the conic sections, because, if aright circular cone is cut by a plane which does not passtlirough the vertex of the cone, the section will be boundedby one of these curves. We will find the equations of the conic sections. Y 63. In finding the equationof the ellipse, we will take… … THE CONIC SECTIONS. II7 of the curve; and r and r, called/^^^/ radii^ measure the dis-tances of P from F and F^ respectively. Let 2 c represent the constant distance between the foci, and2 a the sum of the focal radii, which is constant by the defini-tion of the curve. In the triangle F FP the side…

Geometry, Analytic -- Plane

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