如图,在△ABC中,AD为BC边上的高,若BD=4,DC=5,AD=2
,判断△ABC的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://img.xkw.com/dksih/QBM/2021/8/17/2788327864066048/2790969120161792/STEM/343c6af6-4b98-44d5-a5ab-055bbf3fdfc8.png)
更新时间:2021-08-21 15:04:07
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相似题推荐
解答题-问答题
|
适中
(0.65)
名校
【推荐1】定义:如图,点
把线段
分割成
,若以
为边的三角形是一个直角三角形,则称点
是线段
的勾股分割.
把线段
分割成
,若
,则点
是线段
的勾股分割点吗?请说明理由;
(2)已知点
是线段
的勾股分割点,且
为直角边,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/366635858b24f5969618adfa7f20c7d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db846f1f2cf083fb274fad5f12f452c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8db846f1f2cf083fb274fad5f12f452c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6209ed8f0cc00e7677716c2d3973dc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)已知点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6670479a0083dd2dfd5ad55b47b1ab6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2e28a6b42681434a49992d9eddad8c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
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解答题-证明题
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适中
(0.65)
【推荐2】正方形
中,
为过顶点A的任意一条射线,过C作
于E.
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466149651554304/2467016435736576/STEM/d0b9a26b23f24c3e955c04317edd690e.png?resizew=294)
(1)若
,
,求
的长;
(2)过D作
于F,过C作
于H,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7dcbc0a82c2495d16dd1dfcb7bb0e57.png)
![](https://img.xkw.com/dksih/QBM/2020/5/19/2466149651554304/2467016435736576/STEM/d0b9a26b23f24c3e955c04317edd690e.png?resizew=294)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f979d5406af7e951f386dbb55a9617eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)过D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e68331f8a67933e7591957b4121dda6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
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解答题-作图题
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适中
(0.65)
【推荐1】如图,在10×10的网格中建立如图的平面直角坐标系,线段AB两个端点的坐标分别是A(1,4),B(3,1)
(1)画出线段AB关于y轴对称的线段CD,则点A的对应点C的坐标是 ;
(2)将线段AB先向左平移4个单位,再向下平移5个单位,画出平移后的对应线段EF,观察线段EF与DC是否关于某直线对称?若是,则对称轴是 ;E点坐标是 ;
(3)△ABP是以AB为直角边的格点等腰直角三角形(A,B,P三点都是小正方形的顶点),则点P的坐标是
(1)画出线段AB关于y轴对称的线段CD,则点A的对应点C的坐标是 ;
(2)将线段AB先向左平移4个单位,再向下平移5个单位,画出平移后的对应线段EF,观察线段EF与DC是否关于某直线对称?若是,则对称轴是 ;E点坐标是 ;
(3)△ABP是以AB为直角边的格点等腰直角三角形(A,B,P三点都是小正方形的顶点),则点P的坐标是
![](https://img.xkw.com/dksih/QBM/2021/12/30/2883792369844224/2890197072224256/STEM/e8acd062b00f4a6b945d7ca8e5187613.png?resizew=345)
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解答题-问答题
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适中
(0.65)
【推荐2】(1)在一次数学探究活动中,陈老师给出了一道题.
如图1,已知
中,
,
,
是
内的一点,且
,
,
,求
的度数.
小强在解决此题时,是将
绕
旋转到
的位置(即过
作
,且使
,连接
、
.你知道小强是怎么解决的吗?
(2)请根据(1)的思想解决以下问题:
如图2所示,设
是等边
内一点,
,
,
,求
的度数.
如图1,已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d3fcba360d97fb1fabd96a7ad9384fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2899e607479d8d1c47d954ae9ebb7144.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
小强在解决此题时,是将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0c32d9f3badb7e51233dd39a39fbb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce1132157a33c82610c2d5035493d024.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbf2c197e9f80a5d1ae1463db5b15c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852d91e88a1da79039f97ce694be7717.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e367878cd87da8450711a09c64e021c4.png)
(2)请根据(1)的思想解决以下问题:
如图2所示,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc5c19ac440746be97d8b46af5d288a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/f94be705-52c4-4047-97c1-39a0afe60af4.png?resizew=384)
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