有一块四边形草地
(如图),测得
,
,
,
,求四边形草地
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf2fb2aec699ad2dff28a2cb5f0390be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e80631992368f2cee87b446720987c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcca25052dcb5bb21dabf0a3bfafc123.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/29/ef0b838b-d114-4a55-9886-ae624ec11d8b.png?resizew=185)
更新时间:2023-06-25 21:06:08
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【推荐1】已知如图,四边形ABCD中,∠B=90°,AB=BC=5,CD=
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/f13b7f8e-2271-4164-8cf4-a93879d1f30c.png?resizew=133)
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是直角三角形.
(2)求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/658dfdb747bd314cd22e3a526aba5ec6.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7c310e8859d36c532f2074dde3d934d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/f13b7f8e-2271-4164-8cf4-a93879d1f30c.png?resizew=133)
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(2)求
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