| 摘要 |
PURPOSE: Teaching tools for understanding figures being different according to a view position are provided to enable users to easily understand a changing state of the figures. CONSTITUTION: A hexahedron(3) is composed of a transparent board(1). A plurality of right circles(21) are fixed in a longitudinal direction at the same intervals or different intervals on an inner side or an outer side which the transparent board faces. The right circles are colored. |
