如图,在
中,
,
于点
,
,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/2022/6/20/3005619865411584/3009095270268928/STEM/b2b564a11b744f639c05adc57d28edc9.png?resizew=159)
21-22九年级·全国·假期作业 查看更多[1]
(已下线)第16讲 图形的相似全章复习与测试-【暑假自学课】2022年新九年级数学暑假精品课(北师大版)
更新时间:2022-06-25 19:22:54
|
相似题推荐
解答题-证明题
|
较易
(0.85)
名校
【推荐1】已知,如图,在△ABC中,AD,AE分别是△ABC的高和角平分线.
(1)若∠ABC=30°,∠ACB=60°,求∠DAE的度数;
(2)写出∠DAE与∠C﹣∠B的数量关系 ,并证明你的结论.
(1)若∠ABC=30°,∠ACB=60°,求∠DAE的度数;
(2)写出∠DAE与∠C﹣∠B的数量关系 ,并证明你的结论.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/879fe8d7-8ecb-40e2-8407-75bd77f026d7.png?resizew=191)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐2】如图所示,PA、PB是⊙O的两条切线,A、B为切点.
求证:∠ABO=
∠APB.
求证:∠ABO=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/27/25430adc-eb13-41e5-b1d2-5240fa35363a.png?resizew=175)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
【推荐1】新定义:若一个三角形一条边的平方等于另两条边的乘积,则称这个三角形为比例三角形.例如:
三边的长分别为
,
,
.因为
,所以
是比例三角形.
(1)已知
是比例三角形,
,
,求
的长;
【问题探究】
(2)如图1,P是矩形
的边
上的一动点,
平分
,交边
于点Q,
.
①求证:
;
②求证:
是比例三角形.
【问题延伸】
(3)如图2,在(2)的条件下,当
,
时,点C与点Q能否重合?若能,求出
的值;若不能,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e6f0d6a8356c85f7525b06838803f61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(1)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
【问题探究】
(2)如图1,P是矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40ec709a974b61f0f0a2565d4efe0f58.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56fbe8b18f409dbcd57c73b9b9aafd35.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16448705a2cbec03249ddda74d72c970.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
【问题延伸】
(3)如图2,在(2)的条件下,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c349e9605f47f5fa74d6aa22d424de6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8cc0b4997cae4d8aec791a1d3923314.png)
您最近一年使用:0次
解答题-计算题
|
较易
(0.85)
【推荐2】如图,点
是等边
边
上一点,连接
,作
,交
边于点
若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2d40d5cb59338d3cb1dd504bb12d107.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e28ce60503fab70ce1797449d90dadc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfb08f6a798dc293f3d8de281190f65e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/7/e7c90291-e52c-47c8-b53d-751a4c84d519.jpg?resizew=107)
您最近一年使用:0次