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Geometry explorer, worth downloading. Geared towards geometry constructions more so than Geogebra.

Anything from Wolfram Alpha is going to be rigorous and well done. I like their descriptions. Although I wish there was a more dynamic kind of presentation of derivatives and integrals, etc.

Choose a cross section, then click on the points that lie on the edges of the cube to try and create the cross section. press Create to see what cross section you made, and if you want, you can rotate the cube to take a look at it. It will give you feed

Pattern blocks are great tools for developing conceptual understanding. I hope to continue to see them used in classrooms, but the virtual kind can allow students to share their thinking with other students virtually. I like using screen capture, cut/paste, upload to a wiki, comment on characteristics/size/description of '1'/and sharing with students so that their thikning can be revisited from multiple venues (home, classroom, internet-broader audience).

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