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In geometry, collinearity of a set of points is the property of their lying on a single line. [1] ... In any triangle the following sets of points are collinear:
Triangle DEF is the cevian triangle of P with reference to triangle ABC. Let the pairs of line (BC, EF), (CA, FD), (DE, AB) intersect at X, Y, Z respectively. By Desargues' theorem, the points X, Y, Z are collinear. The line of collinearity is the axis of perspectivity of triangle ABC and triangle DEF.
Here is a definition of triangle geometry from 1887: "Being given a point M in the plane of the triangle, we can always find, in an infinity of manners, a second point M' that corresponds to the first one according to an imagined geometrical law; these two points have between them geometrical relations whose simplicity depends on the more or ...
The three splitters concur at the Nagel point of the triangle. Any line through a triangle that splits both the triangle's area and its perimeter in half goes through the triangle's incenter, and each triangle has one, two, or three of these lines. [2] Thus if there are three of them, they concur at the incenter.
The Nagel point of the medial triangle is the incenter of its reference triangle. [2]: p.161, Thm.337 A reference triangle's medial triangle is congruent to the triangle whose vertices are the midpoints between the reference triangle's orthocenter and its vertices. [2]: p.103, #206, p.108, #1
Then any point P associated with the reference triangle ABC can be defined in a Cartesian system as a vector = +. If this point P has trilinear coordinates x : y : z then the conversion formula from the coefficients k 1 and k 2 in the Cartesian representation to the trilinear coordinates is, for side lengths a, b, c opposite vertices A, B, C ,
The collinearity equations are a set of two equations, used in photogrammetry and computer stereo vision, to relate coordinates in a sensor plane (in two dimensions) ...
The goal of the placement is to avoid small-area triangles, and more specifically to maximize the area of the smallest triangle formed by three of the points. For instance, a placement with three points in line would be very bad by this criterion, because these three points would form a degenerate triangle with area zero.