Date: Nov 11, 2011 12:36 AM
Author: Michael de Villiers
Subject: Exploring and explaining quadrilateral properties, and more

The Student Explorations of my Dynamic Geometry Sketches site has been updated with an online activity about "Exploring and explaining quadrilateral properties" - go to

An interactive link "Some generalizations of Viviani's Theorem" has also been added to:

My new homepage is at and has been updated with:
1) "Simply Symmetric" article - discusses & illustrates the value and use of symmetry, PDF (2011)
2) Nov 2011 Math e-Newsletter
3) mathematical/mathematics education quote
4) mathematics/science cartoon.

Message was edited by: Michael de Villiers