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学生初学立体几何,不习惯看立体图形,空间概念较差,是一个主要的困难。学生的空间观念和看图、画图的能力,是需要长期培养的,但高中立体几何中涉及的立体图形,大多数是直线和平面,如果学生对空间中的直线和直线、直线和平面、平面和平面之间的各种相互关系,能看得懂,想象得出,画得出,那么学起立体几何来就顺利得多。怎样培养学生最初步的空间概念,我的做法是在教课本以前,用一、两个课时进行看模型、画图、识图的教学,具体方法是这样。一、观察模型,看模型画图首先,结合学生的平面几何知识和生活经验,讲一讲平面的概念,然后拿出平面、直线和平面相交及平平面和面相交等模型,让学生观察。
Students beginner stereoscopic geometry, not used to see three-dimensional graphics, the concept of space is poor, is a major difficulty. Students' spatial concepts, drawing ability and drawing ability are required to be cultivated for a long time. However, most of the three-dimensional graphics involved in high school three-dimensional geometry are straight lines and planes. If students are interested in the straight lines and straight lines, straight lines and planes And all kinds of interrelationships between planes, can understand, imagined, drawn, then learned three-dimensional geometry to much better. How to cultivate students the initial concept of space, my approach is to teach in the textbook before, with one or two hours to see the model, drawing, knowledge map teaching, the specific method is this. First, observe the model, see the model drawing First, the combination of students' knowledge of plane geometry and life experience, talk about the concept of plane, and then come out plane, straight line and plane intersection and plane intersection and other models for students to observe.