Hi everyone,

If you've searched for great Sketchpad activities on the internet, I'm sure you've come across the website of Michael de Villiers:

http://dynamicmathematicslearning.com/homepage4.html

Now, on our Sine of the Times blog, Michael has kindly written a guest post for us on the role of refutation in Dynamic Geometry. His post features a very nice interactive Web Sketchpad model. You can see it here:

http://blog.keycurriculum.com/refuta...metry-context/

-Daniel