Quadrilateral Angle Sum
Move points A, B, C or D to create the desired quadrilateral. Move the slider to the extreme right. As each slider appears, rotate the quadrilateral by moving it to the extreme right.
Guillermo Bautista, Created with GeoGebra
The applet above demonstrates that the angle sum of a quadrilateral is 360 degrees.
Snapshot
Guillermo Bautista, Created with GeoGebra
The applet above demonstrates that the angle sum of a quadrilateral is 360 degrees.
Snapshot
