专题08 立体几何-备战2018年高考数学（文）之纠错笔记系列（原卷版）

．在四棱锥中，底面

是菱形，AB?2,?BAD?60?,PC?BD．

（1）证明：； （2）若平面平面

，且?DPB?90?，求点到平面

的距离．

41

13

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42