Reflectory: flip or mirror image of a shape across a line of reflection.

- The flipped image is reflected perpendicularly across the line of reflection
- Lines connecting mirror points will be perpendicular to the line of reflection
- mirror points are equidistant from the line of reflection

- How to algebraically determine mirror points:
- Use the equation of the line of reflection and vertices of the shape to solve for the perpendicular lines.
- Use the midpoint formula and this equation from 1) in order to find the coordinates knowing that the line of reflection is the midpoint of the mirrored point.