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已知球O是棱长为1的正方体ABCD﹣A1B1C1D1的外接球，则平面ACD1截球O所得的截面面积为（ ）
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高二下学期数学《》真题及答案
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已知正方体ABCD-A1B1C1D1的棱长为1点P.是线段A1C1上的动点则四棱锥P-ABCD的外接
已知正方体的棱长为1则正方体的外接球的体积为.
如图所示在棱长为2的正方体ABCD—A1B1C1D1中EF分别为DD1DB的中点．
已知O.是棱长为a的正方体ABCD﹣
1
1
1
1
的对角线的交点，平面α经过点O.，正方体的8个顶点到α的距离组成集合A.，则A.中的元素个数最多有（ ） A.3B.4C.5D.6
如图已知正方体ABCD—A1B1C1D1过BD1的平面分别交棱AA1和棱CC1于EF两点．
如图所示在棱长为2的正方体ABCD—A1B1C1D1中EF分别为DD1DB的中点．
如图所示在棱长为2的正方体ABCD—A1B1C1D1中EF分别为DD1DB的中点．
1与正方体各面都相切的球的表面积与正方体的表面积之比为;2棱长为1的正方体的外接球的体积为.
棱长为a的正方体A1B1C1D1—ABCD中求D1到面AA1C1C的距离为
a
a
a
2a
已知正方体ABCD—A1B1C1D1E为棱CC1的中点． 求证AC∥平面B1DE
已知正方体ABCD—A1B1C1D1E为棱CC1的中点． 求证B1D1⊥AE
如图在正方体ABCD—A1B1C1D1中M是棱DD1的中点O是底面ABCD的中心P是棱A1B1上任
45°
90°
60°
不能确定
正方体ABCD﹣A.′B′C′D′的棱长为1E.为线段B.′C上的一点Ⅰ求正方体ABCD﹣A.′B′
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下列各图中表示正反应是吸热反应的图是
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