如图, 四棱柱ABCD-A1B1C1D1中, 侧棱A1A⊥底面ABCD, AB//DC, AB⊥AD, AD =" CD" =" 1," AA1 =" AB" =" 2," E为棱AA1的中点.
(1) 证明B1C1⊥CE;
(2) 求二面角B1-CE-C1的正弦值.
(3) 设点M在线段C1E上, 且直线AM与平面ADD1A1所成角的正弦值为
, 求线段AM的长.
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如图, 四棱柱ABCD-A1B1C1D1中, 侧棱A1A⊥底面ABCD, AB//DC, AB⊥AD, AD =" CD" =" 1," AA1 =" AB" =" 2," E为棱AA1的中点.
(1) 证明B1C1⊥CE;
(2) 求二面角B1-CE-C1的正弦值.
(3) 设点M在线段C1E上, 且直线AM与平面ADD1A1所成角的正弦值为, 求线段AM的长.
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