如图所示,三棱柱ABC—A1B1Cl中,AB=AC=AA1=2,面ABC1⊥面AAlClC,∠AAlCl=∠BAC1=600,AC1与A1C相交于0.
(1)求证.BO上面AAlClC;
(2)求三棱锥C1—ABC的体积;
(3)求二面角A1—B1C1—A的余弦值.
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如图所示,三棱柱ABC—A1B1Cl中,AB=AC=AA1=2,面ABC1⊥面AAlClC,∠AAlCl=∠BAC1=600,AC1与A1C相交于0.
(1)求证.BO上面AAlClC;
(2)求三棱锥C1—ABC的体积;
(3)求二面角A1—B1C1—A的余弦值.