How to describe the unit circle. How to draw the unit circle and label its parts. How to strategize about finding coordinates on the unit circle.
How to find the midpoint of a segment with endpoints in rectangular coordinates, How to write the midpoint formula.
How the vocabulary word vertex applies to different objects in Geometry.
How to describe a translation; how to interpret ordered pair rules.
How to derive the equation for the distance between two points using the Pythagorean Theorem.