A Treatise on Conic Sections: And the Application of Algebra to Geometry

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Printed at the University Press, for J. & J.J. Deighton, 1845 - 228 páginas
 

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Página 41 - Pappus, the locus of a point whose distance from a given point is in a given ratio to its distance from a fixed...
Página 148 - The locus of the middle points of a system of parallel chords in a parabola is called a diameter.
Página 101 - To find the locus of a point, the difference of whose distances from two fixed points is always equal to a given quantity 2 a.
Página 50 - If the ordinate of P meets the axis in M, and the tangent and normal at P meet the axis in T and N respectively, then MT is the subtangent...
Página 31 - From the preceding equations to the circle, which assume no other property of a circle than that it is the locus of a point which is always at the same distance from a given fixed point, all the theorems relative to the circle established in geometry, may readily be deduced.
Página 67 - Find the locus of a point the sum of whose distances from two fixed intersecting lines is constant, ie, is equal to a given line.
Página 203 - If SY, HZ be perpendiculars from the foci upon the tangent at any point P of an ellipse, then SZ and HY will intersect in the middle point of the normal at P : and the locus of their intersection will be an ellipse whose axes are <г(1 +eг) and a(1 — eг)^.

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