- What a line of symmetry is
- Lines of a regular polygon
- Testing a line: the diagonal trap
- The smallest turn
- Every turn, and the order
- Reflective, rotational, both or neither
- The symmetries of each quadrilateral
- Diagonals and the half-turn
- Following a corner through the motions
- Does the order matter?
- Choosing a sequence
- Two reflections make one motion
- Unlocks after
- Opens up