Euler and triangle geometry

@article{Leversha2007EulerAT,
  title={Euler and triangle geometry},
  author={Gerry Leversha and G. C. Smith},
  journal={The Mathematical Gazette},
  year={2007},
  volume={91},
  pages={436 - 452}
}
There is a very easy way to produce the Euler line, using transformational arguments. Given a triangle ABC, let AʹBʹ'C be the medial triangle, whose vertices are the midpoints of the sides. These two triangles are homothetic: they are similar and corresponding sides are parallel, and the centroid, G, is their centre of similitude. Alternatively, we say that AʹBʹC can be mapped to ABC by means of an enlargement, centre G, with scale factor –2. 
8 Citations
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  • J. Scott
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  • 2011
95.18 Normals to the Euler line In both Cartesian and areal coordinates, the parallelism of lines is simply expressed by means of a null determinant but perpendicularity is rather more problematical
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  • Mathematics
    The Mathematical Gazette
  • 2010
In this note we will discuss five topics from triangle geometry and occasionally encounter something new. Areal coordinates (presented as Appendix A in [1]) will be used throughout, with the
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We introduce a concept "degree of triangle centers", and give a formula expressing the degree of triangle centers on generalized Euler lines. This generalizes the well known 2 : 1 point configuration
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August Möbius introduced the system of barycentric or areal coordinates in 1827 [1, 2]. The idea is that one may attach weights to points, and that a system of weights determines a centre of mass.
96.25 Going halfway with circular boundaries
Problem Corner
  • N.J.L.
  • Education
    The Mathematical Gazette
  • 2010
Problem Corner Solutions are invited to the following problems. They should be addressed to Nick Lord at Tonbridge School, Tonbridge, Kent TN9 lJP (e-mail: njl@tonbridge-school.org) and should arrive
96.26 The Exeter point revisited
  • J. Scott
  • Mathematics
    The Mathematical Gazette
  • 2012

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