Task 1
Check out this triangle below. Move the vertices (LARGE POINTS) of this triangle around. As you do, note the length of the bold side doesn't change.
Use the ANGLE 
tool to measure the angles of this triangle now. To do this the easy way, select the ANGLE tool , click inside the triangle, and then select the MOVE tool 
again (to turn the angle tool off).
Move the vertices (corners) of the triangle around again. Notice anything interesting?