摘要:19.如图.已知斜三棱柱ABC-A1B1C1的侧面A1ACC1与底面ABC垂直.∠ABC=90°.BC=2.AC=.且AA1⊥A1C.AA1=A1C. (1)求侧面A1ABB1与底面ABC所成二面角的大小, (2)求顶点C到侧面A1ABB1的距离, (3)求异面直线与所成的角.

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