http://www.shambles.net/schoolnet/countryreports/myanmar/ict_lessons/maths/G-6%20Some%20Geometrical%20Objects%20in%20Our%20Environments/G-6%20Some%20Geometrical%20Objects%20in%20Our%20Environment(Eng)/G6%20Geo.ppt#256,4,Diapositiva 4
http://www.google.es/search?hl=es&source=hp&q=solid+figures+ppt&meta=&aq=6&oq=solid+figure