1. The volume equation on a Cartesian coordinate plane exists within the first quadrant. 2. The projection set area is then squared for each coordinate plane . 3. Projections of the set are shown in green on the coordinate plane subspaces. 4. Thus, projections appear on the coordinate axes rather than on the coordinate planes . 5. This octahedron can be divided into 8 tetrahedral volumes, by cutting along the coordinate planes . 6. The graph of two variables varying inversely on the Cartesian coordinate plane is a rectangular hyperbola. 7. Plot three points somewhere on a coordinate plane . 8. In a projective space,, a correlation is given by : points in homogeneous coordinates planes with equations. 9. Descartes is often credited with inventing the coordinate plane because he had the relevant concepts in his book. 10. The first partial derivatives of the delta function are thought of as double layers along the coordinate planes .