| 摘要 |
PURPOSE: A regular polyhedron teaching tool is provided to improve availability and intelligibility about a regular polyhedron. CONSTITUTION: A frame is composed of a board and is installed within a regular polyhedron. The frame comprises two rectangular plates(31,32) and one rectangular plate(33). The two rectangular plates form penetrated slits(31a,32a) in a longitudinal center line. The one rectangular plate forms an open slit(33a) in which one end is opened according to the long direction central line. One of the two rectangular plates in which the penetrated slit is formed is perpendicularly inserted to the penetrated slit which is formed in the rest rectangular plate. The rectangular plate in which the open slit is formed is perpendicularly inserted to the penetrated slit in which the rectangular plate is inserted. |
