高二下学期立体几何的教学占了相当大一部分,而立体几何在整个高中数学当中所处的地位非常重要,因为高考数学要考察学生的一项重要能力就是空间想象能力和推理能力。结合近几年的高考试题要考察学生的空间想象能力和推理能力一般都是从立体几何来做文章。因此,学生能否学好立体几何直接影响到高考。而学生只有具备扎实的立体几何基础知识,才能在高考中以不变应万变。首先,要树立起立体观念,培养自己的空间想象能力,做到能想象出空间图形并把它画在一个平面上,还要能根据画在平面上的“立体”图形想象出原来空间图形的真实形状。为了培养 In the second year of high school, the stereo geometry teaching accounted for a large part, and the position of the three-dimensional geometry in the whole high school mathematics is very important, because the college entrance examination mathematics to inspect a student’s important ability is spatial imagination ability and reasoning ability. Combining the high exam questions of recent years to examine students’ spatial imagination and reasoning ability are generally made from three-dimensional geometry. Therefore, whether students can learn three-dimensional geometry directly affects the college entrance examination. Only if students have a solid basic knowledge of three-dimensional geometry can they remain unchanged in the college entrance examination. First of all, we must establish a stereo concept and cultivate our own spatial imagination ability so that we can visualize the space pattern and draw it on a plane, and we can also imagine the original space based on the “stereo” graphics drawn on the plane. The true shape of the graphic. For training