How to describe a translation; how to interpret ordered pair rules.
How to describe the effect of a reflection, how to describe the effect of the ordered pair rules (x,y) -> (-x, y),(x,y) -> (x, -y), (x,y) -> (y, x).
How to derive the equation for the distance between two points using the Pythagorean Theorem.
How to differentiate between the words postulate, axiom, and conjecture.
How to define a circle and a sphere using the word locus.
How the vocabulary word vertex applies to different objects in Geometry.
How to describe a glide reflection and identify the information needed to perform a glide reflection.