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症状一:将空间问题转化为平面问题困难表现不能有效地将空间问题向平面问题转化.症结事实上,任何空间问题最终都要转化为平面问题才能解决,而在这个转化过程中,三垂线定理及其逆定理的运用就是解决问题的关键.
Symptom 1: Converting space problems into planar problems The difficulty of performance cannot effectively transform spatial problems into planar problems. In fact, any spatial problem must eventually be transformed into a plane problem before it can be resolved. In this process of transformation, three vertical lines The use of theorem and its inverse theorem is the key to solve the problem.