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Pįgina 99 - An ellipse is the locus of a point, the sum of whose distances from two fixed points is constant. In Fig. 10.12, the two fixed points are labeled F and F' and are termed the foci of the ellipse, with x coordinates /and/+ 2c.
Pįgina 135 - THE simplest property of the hyperbola is that it is the locus of a point the difference of whose distances from two fixed points is constant. The two fixed points are called tho foci.
Pįgina 61 - A point moves so that the sum of the squares of its distances from the four sides of a square is constant.
Pįgina 13 - The lines joining the middle points of the opposite sides of a quadrilateral bisect each other.
Pįgina 225 - The locus of the middle points of a system of parallel chords in a parabola is called a diameter.
Pįgina 159 - For example, the locus of a point which moves in such a way that its distance from a fixed point is always equal to its distance from a fixed straight line, is a parabola.
Pįgina 61 - Find the locus of a point the sum of the squares of whose distances from two given points is constant.
Pįgina 57 - ... the tangent of the angle which the line makes with the axis of abscissae), was lately employed by M. Crova* for the discussion of experiments relating to the degree of constancy possessed by so-called
Pįgina 90 - The locus of the point of intersection of two tangents to a parabola which...
Pįgina 15 - Let x, y be the co-ordinates of any point P referred to the...