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虽然立体几何问题是立体图形,解析几何问题是平面图形,但两者可以有机结合,相互转化,这正体现了在知识交汇处设计问题的命题方向,于是有关立体几何与解析几何的交汇试题便频频出现.这类问题不仅形式新颖,内蕴深厚,而且非常有利于对能力进行考察.下面我们分两个大方面,进行试题赏析解读.一、立体图形变解析几何图形例1如图,在正方体ABCD-A B C D1 1 1 1中,P是侧面BB C C1 1内一动
Although the three-dimensional geometry problem is a three-dimensional graphics and the analytic geometry problem is a planar one, the two can be combined organically and transformed into each other. This reflects the direction of the proposition of the design problem at the intersection of knowledge. Therefore, the questions about the intersection of solid geometry and analytic geometry Frequently appear .This kind of question not only has the form new, the deep inside, but also is very advantageous to the ability to inspect .In the following two aspects, we carry on the appraisal to read the explanation.A three-dimensional figure changes the analytic geometry figure 1 as the chart, in In the cube ABCD-A BC D1 1 1 1, P is a motion in the side BB C C1 1