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" F'. These points will be the foci, for DF + DF' = 2CV = VV. IV. The hyperbola, which may be generated by moving a point in the same plane, so that the difference of its distances from two fixed points shall be equal to a given line. The two fixed points... "
Elements of Mechanical Drawing - Page 49
by Gardner Chace Anthony - 1894 - 98 pages
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An Introduction to the Graphic Language: The Vocabulary, Grammatical ...

Gardner Chace Anthony - Mechanical drawing - 1922 - 188 pages
...use this method when the major axis is more than twice the minor. 112. The Parabola. — Fig. 179, is a curve generated by a point, moving in a plane so that its disFIG. 178. ELLIPSE c tance from a fixed point shall be constantly equal to its distance from...
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Descriptive Geometry: With Numerous Problems and Practical Applications

William Shaffer Hall - Geometry, Descriptive - 1922 - 138 pages
...and ty will be required tangents. (For proof, see "Analytical Geometry.") 22. The hyperbola may be generated by a point moving in a plane, so that the. difference between its distances from two given points called foci is equal to a given line. PROB. 98. Given the...
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Descriptive Geometry: The Geometry of Projection and Grammar of the Graphic ...

Gardner Chace Anthony, George Francis Ashley - Geometry, Descriptive - 1926 - 266 pages
...intersecting the above lines in points which will lie on the required ellipse. 234. The Parabola, Fig. 297, is a curve generated by a point moving in a plane so that its distance from a fixed point shall be constantly equal to its distance from a given right line....
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Annual Report of the Secretary of War, Volume 4

United States. War Department - 1883 - 1046 pages
...equation of the normal. Examples. LKCTTRE No. XI. (February 14, 1882.) ANALYTIC GEOMETRY. An ellipse is a curve generated by a point moving in a plane so that at each instant the sum of its distances from two fixed points in that plane is constant. An hyperbola...
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