学生初学立体几何,由于缺乏空间想象能力和判断能力,因此感到有一定的难度。在立体几何的入门教学中,教师若将所研究的问题视觉化,指导学生进行模型操作活动,不仅能调动学生学习的积极性,培养他们的操作意识,活跃课堂气氛,而且有助于学生认识立体几何图形的真实形象,形成正确的空间概念,提高空间想象能力,并 Students learn geometry, due to the lack of spatial imagination and ability to judge, so I feel a certain degree of difficulty. In the introductory teaching of stereoscopic geometry, if teachers visualize the problems studied and instruct the students to carry out model operation activities, teachers can not only mobilize the enthusiasm of students, cultivate their sense of operation, and activate the classroom atmosphere, but also help students to recognize the three-dimensional The true image of geometry, the formation of the correct concept of space, improve spatial imagination, and