已知矩形ABCD的边AB=a,BC=3,PA⊥平面ABCD,若边BC上有且只有一点M,使PM⊥DM,则a的值为_____ .
2020高三·全国·专题练习 查看更多[1]
(已下线)第08章 立体几何(单元检测)-2021届高考数学(理)一轮复习讲练测
更新时间:2020-11-25 09:14:32
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【知识点】 证明线面垂直
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