 | Henry John Spooner - Geometrical drawing - 1911 - 196 pages
...constructing it. So we must again resort to the language of co-ordinate geometry, and define a hyperbola as the locus of a point which moves so that its distance from a fixed point called a focus bears a constant ratio to its distance from a fixed straight line called... | |
 | John Henry Tanner, Joseph Allen - Geometry, Analytic - 1911 - 330 pages
...considered. L THE PARABOLA Special Equation of Second Degree 79. The parabola defined. A parabola is the locus of a point which moves so that its distance from a fixed point is equal to its distance from a fixed line. It is the conic section with eccentricity... | |
 | Joseph Harrison, George Albert Baxandall - Geometry, Descriptive - 1913 - 714 pages
...both portions of the complete surface ; and in Art. 76 it was shown that the curve might be denned as the locus of a point which moves, so that its distance from a fixed point bears a constant ratio (greater than unity) to its distance from a fixed line. The curve... | |
 | James Johnstone - Biology - 1914 - 416 pages
...we " plot a curve." Let the latter be a parabola having the equation y=\ x. Now a parabola is denned as " the locus of a point which moves, so that its distance from a fixed point is in a constant relation to its distance from a fixed straight line." How do we construct... | |
 | Virgil Snyder, Charles Herschel Sisam - Geometry, Analytic - 1914 - 318 pages
...from two fixed points is constant. Take the points (± a, 0, 0). 8. Find and classify the equation of the locus of a point which moves so that its distance from (a, 0, 0) bears a constant ratio to its distance (o) from the plane x = 0 ; (&) from the Z-axis. 9.... | |
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A conic section is the locus of a point which moves so that its distance from a fixed point, called the focus, is in a constant ratio to its distance from a fixed straight line, called the directrix. 
