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3 “判定定理”的教学“课标”要求“通过直观感知、操作确认,归纳出直线与平面垂直的判定定理”.为此,教科书安排了“探究:请同学们用一块三角形纸片做实验:如图3,过△ABC 的顶点 A 翻折纸片,得到折痕 AD,将翻折后的纸片竖起放置在桌面上(BD、DC 与桌面接触).(1)折痕 AD 与桌面垂直吗?(2)如何翻折才能使得折痕 AD 与桌面所在平面α垂直?”
3 “judgment theorem ” teaching “lesson standard ” requirement “by intuitional perception, operation confirmation, summed up the straight line and the plane vertical judgment theorem ”. Experiment with a piece of triangular paper: As shown in Figure 3, fold the paper over the vertex A of ABC to get the crease AD, and put the folded paper on the desk (BD and DC are in contact with the desk). 1) Is the crease AD perpendicular to the desktop? (2) How to turn the crease AD perpendicular to the plane α of the desktop? (2)