已知如图,四边形
中
,
,
,且
.求四边形的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/829018a6ca0aff95d89e3f7cd943274e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18120a244d3a1f9c1688bf53eb2ad775.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f4aca5534bce25acaeb7379deed8f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/25/8bcb4a25-d721-43e6-950d-62b5977ff339.png?resizew=116)
更新时间:2023-12-25 20:36:26
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解答题-证明题
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名校
【推荐2】(1)如图1,
是锐角
内一动点,把
绕点
逆时针旋转60°得到
,连接
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(2)图2所示的是一个锐角为30°的直角三角形公园(
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、
为公园的出入口,
,工人师傅准备在公园内修建一凉亭
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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(2)图2所示的是一个锐角为30°的直角三角形公园(
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67dbd5e668ac696bdf1bc7e4e4babc00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7ed53a398b1d6b7b4abbb43a9abcf1f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/87ecdd2b-15fd-4c55-876c-f55cb40e47c6.png?resizew=467)
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【推荐1】若三角形的三边a,b,c满足
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解答题-作图题
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【推荐2】如图的网格中每个小正方形的边长均为
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的两个端点均在格点上;
(1)画出以
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在格点上,且
的面积为
;
(2)在图中画出以
为斜边的
,点
在格点上,且
的面积为
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的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(1)画出以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
(2)在图中画出以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ab0e3f4783faa57520f1f9dff63439.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168bcd54c4f609a9562c2d7b4715aa4b.png)
![](https://img.xkw.com/dksih/QBM/2019/3/18/2163014772744192/2163665757200384/STEM/9c596435398a4695bf42833edc5a37b5.png?resizew=170)
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