How to write an equation for the coordinate planes or any plane that is parallel to one.
How to find a vector normal (perpendicular) to a plane given an equation for the plane.
How to identify parallel lines, a line parallel to a plane, and two parallel planes.
How to plot complex numbers on the complex plane.
How to find the angle between planes, and how to determine if two planes are parallel or perpendicular.
How to graph inequalities in the xy plane.
How to create the different conic sections.
How to express a complex number in trigonometric form.