has part
cartesian coordinate system
Alejandra Gonzalez-Beltran
http://en.wikipedia.org/wiki/Cartesian_coordinate_system
A Cartesian coordinate system is a coordinate system that specifies each point uniquely in a plane by a pair of numerical coordinates, which are the signed distances from the point to two fixed perpendicular directed lines, measured in the same unit of length.
Philippe Rocca-Serra
Orlaith Burke
coordinate system
cartesian coordinate axis
cartesian spatial coordinate origin
ready for release