在平面四边形
中,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/695bdaa8-8665-4194-b56e-f088e0a156b5.png?resizew=143)
(1)求
;
(2)若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65ed8e87249d3c5b9f30a89f5ded4a2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/695bdaa8-8665-4194-b56e-f088e0a156b5.png?resizew=143)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8baab87aaa703b3fe340e8fad36d4426.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55d76905ac2451077244e5cea42e173c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
更新时间:2019-10-14 22:14:12
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a779d6f5d17251bbb3e0d68609efd71d.png)
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