- Reading and writing the equation
- Writing from a point or a diameter
- Graphs and radii that are not whole
- The number that completes the square
- From general form to center and radius
- Dividing first, and not-a-circle cases
- Substitute and solve
- Counting points and finding intercepts
- The tangent at a point
- Unlocks after
- Opens up
- The end of this path.