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我在高一新课程讲授过程中,安排了这样一次探究活动,即研究直角∠ABC在一个平面的射影是什么,一下子引起了学生的兴趣,我要求大家先自己独立思考,然后同桌前后相互讨论,最后推选代表上讲台陈述或补充,并给出证明.甲:直角的射影可以是直角.条件是直角的一边平行于平面(或在平面?
In the course of teaching the new high school curriculum, I arranged for such an inquiry activity to study what is happening at right angles to ABC in a plane. It suddenly caused students’ interest. I asked everyone to think independently before and after the same table. Discuss with each other, and finally select delegates to present or add to the podium, and give proofs. A: The projection of a right angle can be a right angle. The condition is that one side of the right angle is parallel to the plane (or in the plane?