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如图正方体ABCD﹣A′B′C′D′中，二面角D′﹣AB﹣D的大小是（ ）
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正方体ABCD﹣A.1B.1C.1D.1中二面角C.1﹣AB﹣C.的平面角等于__________.
在正方体ABCD—
1
1
1
1
中，平面A.
1
BD与平面C.
1
BD所成二面角的余弦值为( ) A. B. C. D.
在四棱锥V-ABCD中底面ABCD是正方形侧面VAD是正三角形平面VAD⊥底面ABCD如图11-12
如图所示正方形ABCD中E.F.分别是ABAD的中点将此正方形沿EF折成直二面角后异面直线AF与BE
如图11-18直二面角D.-AB-E中四边形ABCD是边长为2的正方形AE=EBF.为CE上的点且B
如图四边形ABCD是正方形PB⊥平面ABCDMA//PBPB=AB=2MAⅠ证明AC//平面PMDⅡ
如图在正方体ABCD―A1B1C1D1中E.为AB的中点.1求直线B1C与DE所成角的余弦值2求证平
正方体ABCD－A1B1C1D1中二面角C1－AB－C.的平面角等于______________.
如图在四棱锥S-ABCD中底面ABCD是正方形SA⊥底面ABCDSA=AB点M.是SD的中点AN⊥S
如图在四棱锥S-ABCD中底面ABCD为正方形侧棱SD⊥底面ABCDE.F.分别是ABSC的中点1求
在边长为2的正方体ABCD-A′B′C′D′中E.是BC的中点F.是DD′的中点1求证CF∥平面A.
如图所示四棱锥P.－ABCD中底面ABCD为正方形PD⊥平面ABCDPD＝AB＝2E.F.G.分别为
如图在正方体中二面角的大小为
如图在棱长为1的正方体ABCD-A1B1C1D1中.1求证BD1⊥平面ACB12求三棱锥B.-ACB
如图直二面角D.-AB-E中四边形ABCD是边长为2的正方形AE=EBF.为CE上的点且BF⊥平面A
在正方体ABCD﹣A.1B.1C.1D.1中P.为AB的中点则二面角B.﹣CA1﹣P.的大小为.
如图正方体ABCD－A.1B.1C.1D.1中求1直线D.1C.与平面AC所成的角2二面角D.1—B
如图所示在矩形ABCD中AD=2AB=2点E是AD的中点将△DEC沿CE折起到△D′EC的位置使二面
如图在正方体ABCD―A1B1C1D1中E.为AB的中点设正方体的棱长为2a.1求AD与B1C所在的
正方体ABCD—A.1B1C1D1中M.N.P.分别为棱ABBCDD1的中点.1求证PB⊥平面MNB
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