National Council of Teachers of Mathematics
The Math Forum: Building a Pyramid
This Math Forum lesson gives instructions on how to build a paper pyramid. Bonuses included finding the surface area and volume of the pyramid.
University of Colorado
University of Colorado: Ph Et Interactive Simulations: Molecule Shapes
Build a molecule in 3-D. Add single, double, and triple bonds, or a lone pair of electrons to an atom, learn what the molecule's geometric name is, see the bond angles, and manipulate each molecule to view it from all sides. Then study a...