Reflection experiment
Predict the location of the image of the pentagon after a reflection about the given line. (Use GeoGebra's tools to draw your prediction.) Then use GeoGebra's built-in tools to reflect the polygon about the line. How close was your prediction?
Experiment by moving the blue points. What do you notice? What do you wonder? Think about how you would reflect the polygon using only angles, circles (including a compass), lines, and line segments.