Date: Feb 1, 2011 5:39 AM
Author: Michael de Villiers
Subject: Sum of Interior Angles of Polygons: A general Formula, and other updates
Just to announce for those interested that my homepage at http://mysite.mweb.co.za/residents/profmd/homepage4.html has been updated with the following new items:

1) PME (1989) paper "A comparative study of two Van Hiele testing instruments"

2) Feb 2011, Math e-Newsletter with info regarding new books, websites, conferences, etc.

3) mathematical/mathematics education quote

4) mathematics/science cartoon

My dynamic geometry sketches Link at http://math.kennesaw.edu/~mdevilli/JavaGSPLinks.htm has been updated with the following (new & revised) sketches:

1) De Villiers points & Hyperbola of a triangle (updated)

2) A generalization of Neuberg & Simson line (updated)

3) Interior Angle Sum of Polygons: A general formula to include crossed ones (new)

4) Some unproved conjectures (updated)

and the Student Explorations section with:

1) Cyclic quadrilateral rectangle result (new)

2) Interior Angle Sum of Polygons: A general formula to include crossed ones (new), with introductory Logo (Turtle Geometry) activity

3) Quadrilateral Inequality involving Perimeter & Diagonals (updated)

4) Added links to 'Mathematical Digest' and 'School Maths'

Message was edited by: Michael de Villiers

Message was edited by: Michael de Villiers

Message was edited by: Michael de Villiers

Message was edited by: Michael de Villiers