Isosceles Triangle: Quick Discovery

Students: The directions for this activity can be found below this applet.
Directions: Use the tools in the GeoGebra applet above to construct a triangle that is EASILY MODIFIABLE, yet ALWAYS REMAINS ISOSCELES. After doing so, proceed to the question below.

Use GeoGebra to measure and display the three interior angles of this ISOSCELES TRIANGLE. After doing so, be sure to move its vertices around. What do you notice? Describe (as best as you can) in your own words.