How to derive the equation for the distance between two points using the Pythagorean Theorem.
How to derive the equation for a circle using the distance formula.
How to find the shortest distance between a point and a line.
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 determine the triangle side inequalities.
How to define and construct an angle bisector.
How to calculate the circumference of a circle.
How to define a circle and a sphere using the word locus.