Equation

Returns the equation of a geometrical object.

equation(Line | Circumference | Conic | Plane)

Given any object of the above, returns its equation with the usual variables x, y (and z).

equation(Line | Circumference | Conic | Plane, List)

Given any object of the above and a list, returns its equation with the usual variables x, y (and z) replaced by the values in the list.