一块试验田的形状如图,已知,
,
,
,
,
,求这块试验田的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ba872e72aaf7d05254361e7e128093b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec7b27a56beb7ebf12220d4371fbc95e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfa7873536aa0a3a41ed2d5c40410f0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0935f2c3768d88c9928ebf41c373bf12.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/15/cd28fb53-e4cf-48ea-9095-f1e993bfa99e.png?resizew=190)
更新时间:2023-09-28 08:04:27
|
相似题推荐
解答题-问答题
|
较易
(0.85)
【推荐1】如图,正方形
的边
与矩形
的边
重合,将正方形
以
秒的速度沿
方向移动,移动开始前点
与点
重合.已知正方形
的边长为
,
,
,设正方形移动的时间为
秒,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/b413f92d-8f66-4bcc-b3d8-01698fda0a18.png?resizew=169)
(1)当
______秒时,
;
(2)若以
、
、
为顶点的三角形同
相似,求
的值;
(3)过点
作
交
于点
,连接
.
①若
的面积为
,
的面积为
,则
的值会发生变化吗?请说明理由;
②当线段
所在直线与正方形
的对角线
垂直时,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d114225333c66ca602b2b1028992866.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/048b61a5fb5f420c6d7de88db5bc3aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc0a0b8ebc284d03ae32388ca71d25d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4485e429836d807d98821952cd90aef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6af5fbb0a33a5c9a3a62109d7cd6d28.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/5/b413f92d-8f66-4bcc-b3d8-01698fda0a18.png?resizew=169)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ec0618ae3a4fde6d6220010af229b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/768fab505d74875e46b743c936148ed5.png)
(2)若以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e8bdf4426d13ebf937df0cbbec75064.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
(3)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdeb1c08d9fe738dc3d593709130ad81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818e85b6d1dba50519ccac5c44c54f8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcaecf08a22124a457128fb04c9c02bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a38c43d922840f5f7693007beeb62b34.png)
②当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
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解答题-作图题
|
较易
(0.85)
名校
【推荐2】作图题
如图,在
中,已知
.
的外接圆
(保留作图痕迹,不写画法)
(2)连接
,
;若
,
,求
的长.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05d35d8d8bb0dc17f2f86fe5b230a2b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ea0df817e3e2cd95b9cd8f73386834c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
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解答题-证明题
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【推荐1】如图(1):已知在△ABC中,AB=AC,P是底边BC上一点,作PD⊥AB于D,PE⊥AC于E,BF⊥AC于F,求证:PD+PE=BF.
[思路梳理]:如图(2):连接AP,必有S△APB+S△APC=S△ABC,因为△ABP、△ACP和△ABC的底相等,所以三条高PD、PE和BF满足关系:PD+PE=BF.
[变式应用]:如图(3):已知在△ABC中,AB=AC,P是底边BC的反向延长线上一点,作PD⊥AB于D,PE⊥AC于E,BF⊥AC于F,求证:PE﹣PD=BF.
[类比引申]:如图(4):已知P是边长为4cm等边△ABC内部一点,作PD⊥BC于D,PE⊥AB于E,PF⊥AC于F,那么PD+PE+PF等于多少.
[联想拓展]:已知某三角形的三条边分别是5cm、12cm、13cm,在平面上有一点P,它到此三角形的三边的距离相等,则这个距离等于多少.
[思路梳理]:如图(2):连接AP,必有S△APB+S△APC=S△ABC,因为△ABP、△ACP和△ABC的底相等,所以三条高PD、PE和BF满足关系:PD+PE=BF.
[变式应用]:如图(3):已知在△ABC中,AB=AC,P是底边BC的反向延长线上一点,作PD⊥AB于D,PE⊥AC于E,BF⊥AC于F,求证:PE﹣PD=BF.
[类比引申]:如图(4):已知P是边长为4cm等边△ABC内部一点,作PD⊥BC于D,PE⊥AB于E,PF⊥AC于F,那么PD+PE+PF等于多少.
[联想拓展]:已知某三角形的三条边分别是5cm、12cm、13cm,在平面上有一点P,它到此三角形的三边的距离相等,则这个距离等于多少.
![](https://img.xkw.com/dksih/QBM/2019/3/6/2154562519998464/2156123112382464/STEM/b4a7680699fd43af80779da315bb5584.png?resizew=451)
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解答题-问答题
|
较易
(0.85)
【推荐2】如图,在
中,
,
,
,点D为
内一点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/89cb74f5-d606-4233-8222-90420e7548e2.png?resizew=224)
(1)求BC的长;
(2)求图中阴影部分(四边形
)的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd0763b031b7e6b6d87ce3554ac482d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/615fc8790237a1b09af51d6bcad6b595.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c24a968c73e960698a572ab01e3698.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/2/89cb74f5-d606-4233-8222-90420e7548e2.png?resizew=224)
(1)求BC的长;
(2)求图中阴影部分(四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/520f8abda6a85e7ef6f281fc2df853fa.png)
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