What Kind of Quadrilateral is This? (Part 1)

Topic:
Angles
There are four activities (parts) to this discovery investigation. This is part 1/4. The link to this lesson activity can be found above the GeoGebra task applet (see below.)
What Kind of Quadrilateral is This? (Part 1) The link for part 2/4 of this lesson activity can be found below the applet.

Use this Applet for PART 1.