| 摘要 |
PROBLEM TO BE SOLVED: To provide a teaching device for making students visually feel how mysterious the theorem of a circumferential angle is. SOLUTION: One large circular ring is formed by connecting a plurality of arc-shaped rail components and a black background plate on which white rectangular marks are drawn at equal intervals is fitted outside the rail component to constitute the theorem teaching device. A cylindrical spectacle which has a pinhole on one side and is made open on the other side and as large as a film case is placed on the rail components to observe the distance between two specific rectangular marks on the background plate with the naked eye, thereby confirming a phenomenon in which the distance does not vary at any viewpoint on the circumference. COPYRIGHT: (C)2005,JPO&NCIPI
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