René Descartes
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Coordinated geometry was conceived by the French mathematician Rene Descartes.
history of co-ordinate geometry
Rene Descartes
Contrapositive Cube Coordinate Geometry Coplanar Converse Convex set Coordinate Coordinate Plane Coordinatized line Corollary to a theorem Corresponding Angles Counterclockwise
For a reflection over the x axis, leave the x coordinate unchanged and change the sign of the y coordinate.For a reflection over the y axis, leave the y coordinate unchanged and change the sign of the x coordinate.