How to identify parallel lines, a line parallel to a plane, and two parallel planes.
How to use standard form of a line.
How to take the converse of the parallel lines theorem.
How to graph a line.
How to find the vector and parametric equations of a line when given two points on the line.
How to find the shortest distance between a point and a line.
How to determine whether lines are parallel, perpendicular, or neither.
How to determine whether two lines in space are parallel or perpendicular.
How to write the vector equation of a line.
How to find the polar equation of a line through the origin (or pole).
How to write the parametric equations of a line segment that goes from point A to point B.
How to prove two triangles are similar using a line parallel to a base.
How to write equations describing motion in a straight line given the velocity and the position when t=0.
How to describe and label point, line, and plane. How to define coplanar and collinear.
How to prove that opposite angles in a cyclic quadrilateral are congruent; how to prove that parallel lines create congruent arcs in a circle.
How to graph a line using the x and y intercepts.
How to duplicate a line segment using a compass and straightedge.