已知四棱锥
中,点S在平面
上的投影为点D,且
,底面
是面积为45的正方形,过线段
的中点E和点B引平面
,使得直线
平面
,直线
平面
平面
,则四边形
的面积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ec0ee564b88aba7fd4e4429b2526b5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b902692f06621567b64e030cc6b199b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcff61b0e4b94e7299feccbaf8f7346e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71077984163f126d37aa0995e9c9ae47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc7b109f3a6ee5d5e12496912a4bc30a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f88696fcfe4675488fe5e7e812962df3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105755d8dad4e09a00507ed079535c43.png)
21-22高三上·河南·阶段练习 查看更多[2]
更新时间:2021-12-26 07:01:02
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【知识点】 线面垂直证明线线垂直
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【推荐2】已知直角三角形
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