1 . 如图,三棱锥
中,
平面
,
,
为
中点,下列说法中正确的是_________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/ab96a043-4f6b-44cd-b3ef-edbe871cc9cf.png?resizew=162)
①
;
②记二面角
的平面角分别为
;
③记
的面积分别为
;
④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8bd8c13192ca45c16dad5d59b547220.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/16/ab96a043-4f6b-44cd-b3ef-edbe871cc9cf.png?resizew=162)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d929cd2bf2e220f08de492d9f7c172c.png)
②记二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c23154639b674ee528e16ab56922f0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d3827d8d9b7545cbcc0b02d054e211.png)
③记
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0df33594abfd5d3e439e1fa87e5ee38e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b410baa0393d60c0932c2bdaf7d2626.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ae020a98c61318a8e634d29aa91f0e4.png)
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