点O是边长为4正方形ABCD的中心,点E,F是AD,BC的中点,沿对角线AC把正方形ABCD折叠成直二面角D-AC-B.1.求角EOF的大小 2.求二面角E-OF-A的大小
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![点O是边长为4正方形ABCD的中心,点E,F是AD,BC的中点,沿对角线AC把正方形ABCD折叠成直二面角D-AC-B.1.求角EOF的大小 2.求二面角E-OF-A的大小](/uploads/image/z/11235025-1-5.jpg?t=%E7%82%B9O%E6%98%AF%E8%BE%B9%E9%95%BF%E4%B8%BA4%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E7%9A%84%E4%B8%AD%E5%BF%83%2C%E7%82%B9E%2CF%E6%98%AFAD%2CBC%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E6%B2%BF%E5%AF%B9%E8%A7%92%E7%BA%BFAC%E6%8A%8A%E6%AD%A3%E6%96%B9%E5%BD%A2ABCD%E6%8A%98%E5%8F%A0%E6%88%90%E7%9B%B4%E4%BA%8C%E9%9D%A2%E8%A7%92D-AC-B.1.%E6%B1%82%E8%A7%92EOF%E7%9A%84%E5%A4%A7%E5%B0%8F+2.%E6%B1%82%E4%BA%8C%E9%9D%A2%E8%A7%92E-OF-A%E7%9A%84%E5%A4%A7%E5%B0%8F)
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