已知正方体ABCD-A1B1C1D1棱长为1,求证平面AB1C与平面A1C1D平行
人气:420 ℃ 时间:2019-08-19 13:30:41
解答
由于正方体ABCD-A1B1C1D1,A1D//B1C,则A1D//平面AB1CA1C1//AC,则A1C1//平面AB1CA1D与A1C1相交与点A1,则平面AB1C//平面A1C1D两个平面平行的判定定理:如果一个平面内有两条相交直线都平行于另一个平面,那么这两个平面...
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