Geodesic
Rotor Coordinates, Vector Trigonometry and Quadrilaterals, with Applications to the Four Bar Linkage
Journal for geometry and graphics, Tome 22 (2018) no. 2, pp. 257-268 Cet article a éte moissonné depuis la source Heldermann Verlag

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The aim of this paper is to explain how the new theory of vector trigonometry which uses rotor coordinates instead of polar coordinates gives us new relations for quadrilaterals, and how these can be applied to the classical four bar linkages of kinematics.
Classification : 51N20, 70A05, 97G60, 53A17
Mots-clés : Rational trigonometry, vector trigonometry, half-slope, four bar linkage, quadrilateral 
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     author = {N. J. Wildberger },
     title = {Rotor {Coordinates,} {Vector} {Trigonometry} and {Quadrilaterals,} with {Applications} to the {Four} {Bar} {Linkage}},
     journal = {Journal for geometry and graphics},
     pages = {257--268},
     year = {2018},
     volume = {22},
     number = {2},
     url = {http://geodesic.mathdoc.fr/item/JGG_2018_22_2_JGG_2018_22_2_a9/}
}
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N. J. Wildberger . Rotor Coordinates, Vector Trigonometry and Quadrilaterals, with Applications to the Four Bar Linkage. Journal for geometry and graphics, Tome 22 (2018) no. 2, pp. 257-268. http://geodesic.mathdoc.fr/item/JGG_2018_22_2_JGG_2018_22_2_a9/