 The parabola may also be defined as the locus of a point whose distance from a fixed point ( the focus) is equal to its distance from a fixed straight line (the directrix), ie its eccentricity (qv) is 1. From this definition its construction readily follows....  Analytical Geometry (the Straight Line and Circle). - Page 70by Arthur Le Sueur - 1886 - 103 pagesFull view - About this book
 | Daniel Kinnear Clark - Mechanical engineering - 1892 - 682 pages
...proportions >f ellipses. "i The parabola is a curve snch that the distance of any point in the curve from a fixed point, the focus, is equal to its distance from a straight line, the directrix. To detcribe a Parabola, when an absciss and ils ordinale, or the height... | |
 | Charlotte Angas Scott - Conic sections - 1907 - 452 pages
...140. The p«rttbola. Formulas and equations. Definition. — A parabola is the locus of a point whose distance from a fixed point, the focus, is equal to...distance from a fixed line, the directrix. Equation. — The simplest form of the equation is у1 = 4рж, obtained by taking the origin half-way between... | |
 | Frank Moore Colby, Talcott Williams - Education - 1922 - 922 pages
...the limiting form of a straight line. The parabola may also be defined as the locus of a point whose distance from a fixed point (the focus) is equal to its distance from a fixed straight line (the directrix), ie, its eccentricity (qv) is 1. From this definition its construction... | |
 | Daniel Pedoe - Mathematics - 1983 - 338 pages
...it is easily proved that ST = TN, so that we now have the celebrated method of drawing a parabola as the locus of a point which moves so that its distance...to its distance from a fixed line (the directrix). In our paper-folding envelope construction, the line m is the directrix of the parabola. This focus-directrix... | |
 | Philosophy - 2000 - 580 pages
...prevent the disease from developing. parabola Mathematical curve, a CONIC section traced by a point that moves so that its distance from a fixed point, the focus, is equal to its distance from a fixed straight line, the directrix. It may be formed by cutting a cone parallel to one side. The general... | |
 | Lyn Baker - Mathematics - 2001 - 242 pages
...values, A parabola can be defined as the locus of a point whose distance from a fixed point, called the focus, is equal to its distance from a fixed line, the directrix. ¿ Find the Locus of a point P(x, y) which moves so that its distance from S(0, A) is equal to its... | |
 | 352 pages
...shall start from the 'focus directrix' definition: The parabola is the locus of a point which varies so that its distance from a fixed point, the focus,...to its distance from a fixed line, the directrix, which does not contain the focus. Let S be the focus and DD' the directrix. Let the perpendicular from... | |
 | Edward Harrington Lockwood - Curves - 1967 - 290 pages
...angle. 12. It is the negative pedal of a straight line. 13. It is the locus of a point in a plane whose distance from a fixed point (the focus) is equal to its distance from a fixed line (the directrix). 14. It is the form assumed by a hanging chain under a uniform horizontal distribution of load (cf.... | |
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