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2018_2019学年高中数学第二章点、直线、平面之间的位置关系2.3.1直线与平面垂直的判定情境导学素材新人教A版必修2.doc

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2018_2019学年高中数学第二章点、直线、平面之间的位置关系2.3.1直线与平面垂直的判定情境导学素材新人教A版必修2.doc_第1页
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12.3.1 直线与平面垂直的判定【情境导学】将一块三角形纸片 ABC 沿折痕 AD 折起,将翻折后的纸片竖起放置在桌面上(BD,DC 与桌面接触).观察折痕 AD 与桌面的位置关系.思考如何翻折才能使折痕 AD 与桌面垂直.怎样折叠才能使 AD 与桌面垂直?(当 AD 是高时,即 ADBD,ADCD 时 AD 与桌面垂直)

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