已知正四棱锥P-ABCD的棱长均为1,O为底面ABCD的中心,M,N分别是棱PA,PB的中点,则( )
A.PA⊥OM | B.直线AP与平面OMN所成的角的余弦值为![]() |
C.平面OMN∥平面PCD | D.四棱锥P-ABCD的外接球的体积为![]() |
21-22高二下·江苏常州·期末 查看更多[2]
更新时间:2022-06-27 17:54:32
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【推荐2】如图,棱长为2的正方体
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