Medians & Equal Areas!

In the app below, the LARGE VERTICES are moveable. The smaller points shown on the triangle's sides are midpoints. Interact with the app below and observe what happens. Be sure to move the triangle's large vertices around as you explore!

How would you describe the first three segments drawn? What are they? How do you know this?

What does this animation suggest about all six non-overlapping triangles? Explain how this animation helps suggest your assertion.