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 define the apothem and center of a polygon; how to divide a regular polygon into congruent triangles.
How to identify the centroid and the way it divides each of the medians.
How to derive the equation for a circle using the distance formula.
How to define a circle and identify its main parts.
How to perform and describe a dilation.