Plane Analytic Geometry: With Introductory Chapters on the Differential Calculus

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H. Holt, 1915 - Geometry, Analytic - 235 pages
 

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Page 96 - Find the locus of a point, the distances of which from two given straight lines have a fixed ratio. 143. Find the locus of a point which moves so that the sum of its distances from two vertices of an equilateral triangle shall equal its distance from the third.
Page 97 - Show that the locus of a point which moves so that the sum of its distances from two h'xed straight lines is constant is a straight line.
Page 17 - The sum of the squares of the sides of any quadrilateral is equal to the sum of the squares of the diagonals plus four times the square of the line joining the middle points of the diagonals.
Page 17 - The line joining the middle points of two sides of a triangle is parallel to the third side and equal to half of the third side.
Page 109 - An ellipse is a curve which is the locus of a point that moves in a plane so that the sum of its distances from two fixed points in the plane is constant.
Page 109 - An hyperbola is a curve which is the locus of a point that moves in a plane so that the difference of its distances from two fixed points in the plane is constant.
Page 96 - 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.
Page 109 - It may also be defined as the locus of a point which moves in a plane so that its distance from a fixed point, called the focus.
Page 15 - The straight lines joining the vertices of a triangle to the middle points of the opposite sides meet in a point* which is for each line the point of trisection further from the vertex.
Page 107 - The locus of a point, the sum of the squares of whose distances from n fixed points is constant, is a circle.

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