Type Command

For conics and quadrics this command returns a number representing the conic/quadric type according to the table below. In this context, an empty conic (or quadric) is one whose coefficients are defined, but that does not contain any real point, e.g. x² + y² = -1. For conics, GeoGebra distinguishes double line (special case of parallel lines with distance 0) and single line (special case of circle with infinite diameter, may result from circle inversion). For quadrics there is no such distinction.