Sunday, October 14, 2012

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. 
This is a Java Applet created using GeoGebra from - it looks like you don't have Java installed, please go to
Guillermo Bautista, Created with GeoGebra

The applet above demonstrates that the angle sum of a quadrilateral is 360 degrees. 



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