http://www.harcourtschool.com/activity/solid_figures/

http://pbskids.org/cyberchase/games/pointofview/pointofview.html

http://www.learner.org/teacherslab/math/geometry/space/train/index.html

http://www.learner.org/teacherslab/math/geometry/space/plotplan/index.html

http://www.learner.org/teacherslab/math/geometry/space/shadows/index.html

http://nlvm.usu.edu/en/nav/category_g_4_t_3.html