三棱锥被平行于底面ABC的平面所截得的几何体如图所示,截面为A1B1C1,∠BAC=90°,A1A⊥平面ABC,A1A=根号3,AB=根号2,AC=2,A1C1=1,BD/DC=1/2,平面A1AD⊥平面BCC1B1求二面角A-C1C-B的平面角的余弦值图在下方:
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![三棱锥被平行于底面ABC的平面所截得的几何体如图所示,截面为A1B1C1,∠BAC=90°,A1A⊥平面ABC,A1A=根号3,AB=根号2,AC=2,A1C1=1,BD/DC=1/2,平面A1AD⊥平面BCC1B1求二面角A-C1C-B的平面角的余弦值图在下方:](/uploads/image/z/7854706-10-6.jpg?t=%E4%B8%89%E6%A3%B1%E9%94%A5%E8%A2%AB%E5%B9%B3%E8%A1%8C%E4%BA%8E%E5%BA%95%E9%9D%A2ABC%E7%9A%84%E5%B9%B3%E9%9D%A2%E6%89%80%E6%88%AA%E5%BE%97%E7%9A%84%E5%87%A0%E4%BD%95%E4%BD%93%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%88%AA%E9%9D%A2%E4%B8%BAA1B1C1%2C%E2%88%A0BAC%3D90%C2%B0%2CA1A%E2%8A%A5%E5%B9%B3%E9%9D%A2ABC%2CA1A%3D%E6%A0%B9%E5%8F%B73%2CAB%3D%E6%A0%B9%E5%8F%B72%2CAC%3D2%2CA1C1%3D1%2CBD%2FDC%3D1%2F2%2C%E5%B9%B3%E9%9D%A2A1AD%E2%8A%A5%E5%B9%B3%E9%9D%A2BCC1B1%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92A-C1C-B%E7%9A%84%E5%B9%B3%E9%9D%A2%E8%A7%92%E7%9A%84%E4%BD%99%E5%BC%A6%E5%80%BC%E5%9B%BE%E5%9C%A8%E4%B8%8B%E6%96%B9%3A)
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