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立体几何的内容,一般是从静止的状态来研究空间图形中各种问题的,但有关几何量的极值问题却从运动的观点着手,考察空间图形中某些几何元素的变化,明确题目中定量与变量的关系以求找到某些极值的位置.解这类问题,经常需要用到平面几何、三角、代数等方面的知识,综合性强,方法灵活,常常通过对称、旋转、折叠或展平等转化,将空间问题归结为平面
The content of the three-dimensional geometry is generally from the static state to study various problems in the space graph, but the problem of the extreme value of the geometrical quantity starts from the perspective of the movement, examines the changes of certain geometric elements in the space graph, and clearly defines the problem. The relationship between quantification and variables in order to find the position of certain extreme values. To solve such problems, we often need to use the knowledge of plane geometry, trigonometry, algebra, etc. It is comprehensive and flexible, often through symmetry, rotation, folding or Fair transformation of exhibitions, which categorizes space issues as flat