intersecting lines
51Cartesian coordinates — Carte′sian coor′dinates n. pl. math. a system of coordinates for locating a point on a plane by its distance from each of two intersecting lines, or in space by its distance from each of three planes intersecting at a point. Comparex axis, y axis …
52Cartesian coordinates — Math. a system of coordinates for locating a point on a plane (Cartesian plane) by its distance from each of two intersecting lines, or in space by its distance from each of three planes intersecting at a point. [1885 90] …
53cross — I. noun Etymology: Middle English, from Old English, from Old Norse or Old Irish; Old Norse kross, from Old Irish cros, from Latin cruc , crux Date: before 12th century 1. a. a structure consisting of an upright with a transverse beam used… …
54Wundt illusion — The Wundt illusion is an optical illusion that was first described by the German psychologist Wilhelm Wundt in the 19th century. The two red vertical lines are both straight, but they may look as if they are bowed inwards to some observers. The… …
55Hilbert's arithmetic of ends — is an algebraic approach introduced by German mathematician David Hilbert for Poincaré disk model of hyperbolic geometry [Hilbert, A New Development of Bolyai Lobahevskian Geometry as Appendix III in Foundations of Geometry , 1971.] . Hilbert… …
56List of disproved mathematical ideas — In mathematics, ideas are supposedly not accepted as fact until they have been rigorously proved. However, there have been some ideas that were fairly accepted in the past but which were subsequently showed to be false. This article is meant to… …
57cross — crossable, adj. crossability, n. /kraws, kros/, n., v., adj., crosser, crossest. n. 1. a structure consisting essentially of an upright and a transverse piece, upon which persons were formerly put to death. 2. any object, figure, or mark… …
58Dehn planes — In geometry, Dehn constructed two examples of planes, a semi Euclidean geometry and a non Legendrian geometry, that have infinitely many lines parallel to a given one that pass through a given point, but where the sum of the angles of a triangle… …
59cross — /krɒs / (say kros) noun 1. a structure consisting essentially of an upright and a transverse piece, upon which persons were formerly put to death. 2. a figure of the cross as a Christian emblem, badge, etc. 3. the cross as the symbol of… …
60vertical angle — noun either of two equal and opposite angles formed by the intersection of two straight lines • Hypernyms: ↑angle * * * noun 1. : an angle measured on a vertical circle either upward or downward from the horizon 2. : either of two angles lying on …
