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题型:解答题 题类:常考题 难易度:容易
如图,四棱柱ABCD﹣A1B1C1D1中,侧面AA1D1D为矩形,AB⊥平面AA1D1D,CD⊥平面AA1D1D,E、F分别为A1B1、CC1的中点,且AA1=CD=2,AB=AD=1.
(1)求证:EF∥平面A1BC;
(2)求D1到平面A1BC1的距离.
求证:(I) C1O∥面AB1D1;
(II)面A1C⊥面AB1D1 .
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