Congruent Segments: Quick Exploration

The following app illustrates what it means for segments to be classified as congruent segments.  

Interact with the applet below for a few minutes. Be sure to move the LARGE POINTS around each time before you drag the slider! Then answer the questions that follow.

What transformations have we learned about so far? List them.

What transformations did you observe here while interacting with this app?

What does it mean for segments to be classified as congruent segments? Explain.