如图,在
中,
,点E,F在
上,点D,G分别在
上,且四边形
是正方形,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5dfc2edd439281ad211a3736f9484a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afece661d4514d6f08e1cd51dec178b0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/17/d61376e7-499a-4844-b8d7-9389a12c4034.png?resizew=125)
23-24九年级上·北京·期末 查看更多[1]
(已下线)专题12 相似三角形的六种题型-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(北京专用)
更新时间:2024-01-18 10:45:02
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【推荐1】如图,正方形ABCD,点E,F分别在AD,CD上,且DE=CF,AF与BE相交于点G.
(1)求证:BE=AF;
(2)若AB=4,DE=1,求AG的长.
(1)求证:BE=AF;
(2)若AB=4,DE=1,求AG的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/987bed8e-09cf-41e9-97ac-93b1ae70ff86.png?resizew=149)
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【推荐2】如图,点E是正方形ABCD的边BC上的动点,
,且
,
.
![](https://img.xkw.com/dksih/QBM/2021/6/24/2750136590368768/2750615854030848/STEM/773ea1f2fcc1472c8c2b98dd2b363ba8.png?resizew=187)
(1)求证:
;
(2)若
,
,用x表示DF的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7521601ac1fbc4a52d4fe44be9c8e88c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03b70c662d45c1b741ea5ed7a31007cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61548f6705e6ff2cb8c3b67de55b59be.png)
![](https://img.xkw.com/dksih/QBM/2021/6/24/2750136590368768/2750615854030848/STEM/773ea1f2fcc1472c8c2b98dd2b363ba8.png?resizew=187)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccdce77ba90b243541419d575d47945a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c29bf5a05dd46f6e03dfd22c32f7ce1.png)
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【推荐1】如图,在
中,
,
,
,以点
为圆心,
为半径作圆,点
为
上的动点,连接
,作
,使点
落在直线
的上方,且满足
,连接
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ee4a2510c4c5091513b3ab2dca6f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/8463ce21-4dbb-45ad-b5d5-d2a90afcdfda.png?resizew=348)
(1)
_____度;
(2)求证:
.
(3)当点
在
上时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ffc2817fa590affb5a760a25dc65308.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e3ce781e575032d1decc9a2b1e88fa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cee6765a83140d745a6de4c85d9b6b50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68776fbd0dfbb1380475aa4349e31e0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d3ee4a2510c4c5091513b3ab2dca6f3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/15/8463ce21-4dbb-45ad-b5d5-d2a90afcdfda.png?resizew=348)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4397f6e86c69e6b597e7e8635afbfb8.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fa6225c001cc13007d3691c291c19dd.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70c733c8bb6ee8666dc5477d5fb8c6ab.png)
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【推荐2】为了测量教学楼的高度,甲、乙两个数学研究小组设计了不同的方案,测量方案与数据如下表:
请选择其中一个方案及其测量数据求教学楼的高
.(结果精确到
.参考数据:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cfe09ea799644eebca1c5dd2d1029b.png)
)
课题 | 测量教学楼高度 | |
测量方案 | 方案一 | 方案二 |
测量工具 | 自制直角三角形模具,皮尺 | 皮尺,测角仪 |
测量示意图 | ||
测量步骤 | 甲小组成员通过调整自己的位置,使自制的直角三角形模具![]() ![]() ![]() | 乙小组成员在教学楼对面的实验楼C处用 测角仪分别测得教学楼底部A点的俯角和教学楼顶部B点的仰角. |
说明 | A,B,C,D,E,R均在同一平面内,测角仪高度忽略不计 | |
测量数据 | ![]() | ![]() ![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32cfe09ea799644eebca1c5dd2d1029b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df276e9b9424486d59c747f1227b213c.png)
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