在如图所示的一块木料中,棱BC平行于面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/e9a23f34-58da-468d-853e-334331815132.png?resizew=222)
(1)要经过面
内的一点P和棱BC将木料锯开,应怎样画线?
(2)所画的线与平面AC是什么位置关系?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/16/e9a23f34-58da-468d-853e-334331815132.png?resizew=222)
(1)要经过面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24cfad1ba71a78d8f415335cde2f8c52.png)
(2)所画的线与平面AC是什么位置关系?并说明理由.
更新时间:2022-07-12 14:43:57
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解答题-证明题
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【推荐1】如图,在正方体
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(2)求证:
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(3)求证:
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【推荐2】在立体几何中,用一个平面去截一个几何体得到的平面图形叫截面. 如图,在棱长为1的正方体
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【推荐1】在四棱锥
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【推荐2】如图,已知正方体
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【推荐3】如图,在三棱柱ABC-A1B1C1中,侧面ABB1A1,ACC1A1均为正方形,∠BAC=90°,D为BC中点.
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(1)求证:A1B∥平面ADC1;
(2)求证:C1A⊥B1C;
(3)求直线B1C1与平面A1B1C所成的角.
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(1)求证:A1B∥平面ADC1;
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