Polygon Sum Conjecture:
The Angle Sum applet- illuminations.nctm.org/ActivityDetail.aspx?ID=9 for the "Adding It All Up" activity.
Triangulation:
To triangulate any polygon, connect all diagonals from one vertex.
Compete the "Adding It All Up" activity with your group.
Sum of Exterior Angles of a Polygon Conjecture:
Forming the exterior angles - www.absorblearning.com/media/attachment.action?quick=dr&att=982
Link to intearctive polygons - https://www.mathsisfun.com/geometry/polygons-interactive.html
Star Polygons
mathworld.wolfram.com/StarPolygon.html