How to find a vector normal (perpendicular) to a plane given an equation for the plane.
How to find the angle between planes, and how to determine if two planes are parallel or perpendicular.
How to write an equation for the coordinate planes or any plane that is parallel to one.
How to identify parallel lines, a line parallel to a plane, and two parallel planes.
How to construct a perpendicular line at a point on a line.
How to plot complex numbers on the complex plane.
How to construct a midpoint and how to define a perpendicular bisector.
How to determine whether lines are parallel, perpendicular, or neither.
How to describe and label point, line, and plane. How to define coplanar and collinear.
How to determine whether two lines in space are parallel or perpendicular.
How to find the shortest distance between a point and a line.
How to graph inequalities in the xy plane.
How to define a chord; how to describe the effect of a perpendicular bisector of a chord and the distance from the center of the circle.
How to find the midpoint of a segment with endpoints in rectangular coordinates, How to write the midpoint formula.
Understanding transverse waves.
How to derive the equation for the distance between two points using the Pythagorean Theorem.
Short, helpful video on ACT Geometry by top ACT prep instructor, Devorah. Videos are produced by leading online education provider, Brightstorm.