人教版教材在《西方古典哲学的代表柏拉图》一课的导语部分有这样一段叙述:“学园门口写着‘不懂几何者不得入内’”。正文又说:“柏拉图强调,进入学园的人必须学好几何,否则就难以进入深奥的哲学殿堂。”~([1])为什么柏拉图强调几何?几何与他的哲学有怎样的关系?参考书和各种教辅用书对此都语焉不详,这个问题成为教师的一个困惑。 PEP textbook in the introductory part of “a lesson on behalf of Platonics in Western Classical Philosophy” has such a narrative: “entrance to the school said ” do not understand the geometry of those who can not enter “. The text goes on to say: ”Plato emphasizes that people who enter the academy must learn geometry, otherwise it is difficult to enter the esoteric philosophical hall. " ~ ([1]) Why does Plato emphasize geometry? How does geometry relate to his philosophy? Reference books and a variety of supplementary books are all absent-minded, this question has become a teacher confusion.