I will probably blog much less during the summer months, given that I am leading many workshops, one after another, with little breathing time in between. I will also probably do little updating of my Web site, so this is a good time to let you know of some recent additions and tweaks.
New: An excellent Shrinky Dinks activity by Rachel Chou, a teacher and department chair at Menlo School in Atherton, CA. I link to it in my Geometry Labs page, as it is very compatible with those activities both in subject matter (Section 10 of the book) and in the hands-on approach.
Tweak: I improved the worksheet on deriving a proof of the quadratic formula based on translating a parabola so its vertex is at the origin. Prerequisites are on my Parabolas and Quadratics page.
Tweak: I improved the worksheet on Graphing Square Roots, which among other things leads to the formal definition of absolute value as a piecewise function.
New-ish: An introduction to the glide reflection, a rigid motion every teacher should know about. (It is an edited concatenation of two blog posts, so it would not be new to regular readers of this blog.)
Maybe you can find time this summer to incorporate some of these materials into next year’s classes?
PS: some of these updates are part of preparing for my Visual Algebra and No Limits (Algebra 2 / Precalc) workshops, late July in Saint Louis. More info.