Courtesy of the TECHlearning blog, this interactive 3D geometry site from Annenburg is a lot of fun! You can explore and play with prisms and pyramids, surface area and volume, and you can even print, cut and fold examples of several 3D shapes.
Because you can rotate the shapes, and highlight vertices, edges, and faces it makes it easier to understand, at least it did for me, and I consider myself "challenged" spatially. http://www.learner.org/interactives/geometry/index.html
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