**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.)

**New-ish**: I improved the worksheet on Perspective, and added teacher notes and a GeoGebra applet. It is a good way to introduce inverse variation by way of a real-world lab.

Maybe you can find time this summer to incorporate some of these materials into next year's classes?

--Henri

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.

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