如图,在等腰直角
中,
,D为平面上一动点,在运动过程上保持
于点D,将
沿
翻折得到
,在直线
上取点F,作
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/72fea53e-5f39-4c35-a002-c3c5f32d0ccd.png?resizew=244)
(1)如图1,若
与
相交于点G,求证
;
(2)猜想
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/650c6c818df102a83ce5159e3208d01a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6615992e260ded5b9f9c26eb719386.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/72fea53e-5f39-4c35-a002-c3c5f32d0ccd.png?resizew=244)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4f0d0cb6e72a1077e76d9542f42e5eb.png)
(2)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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 10:45:04
|
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解答题-证明题
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适中
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【推荐1】如图,△ABC中,BC边上二点D、E,有4个论断:①AB=AC; ②AD=AE; ③BD=CE;④∠1=∠2,请你从4个论断中选2个作为已知(题设),选1个作为结论,构成一个真命题,并给予证明.
已知:
求证:
证明:
已知:
求证:
证明:
![](https://img.xkw.com/dksih/QBM/2019/10/24/2318990792032256/2320720798064640/STEM/e043a5f8749246178989af127709b1a5.png?resizew=167)
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解答题-证明题
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适中
(0.65)
名校
【推荐2】如图,长方形
中,
,
,点P在边
上,且不与点B、C重合;将
沿直线AP折叠得到
,点
落在矩形
的内部,延长
交直线
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/2659fd10-b64a-4673-ba50-8476704dde20.png?resizew=141)
(1)证明
;
(2)当P为
中点时,求
的值;
(3)连接
,求
周长的最小值;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af2cc5f8cec8c498aa12c99c04e1c97d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b33bcb6c77eea836834569a04538899.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/143e346ac3950f60077291dda2be73c3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/2659fd10-b64a-4673-ba50-8476704dde20.png?resizew=141)
(1)证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4a7f0592f83c4e6ddeb73c54551611c.png)
(2)当P为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/020ebe1219437129358b986eb9e70bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c041b33a5c91faa954a6fc49a7cd1999.png)
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解答题-应用题
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适中
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【推荐1】为了测量路灯EP的长度,小明从灯杆底部N沿人行道拉一皮卷尺到B处,在
之间水平放置一平面镜,移动镜子的位置分别到C,D两点时,小明恰好能在镜中分别看到两灯全貌,其视线如图所示,已知点B,C,D,N在同一水平直线上,且
,
均垂直于
,D、P、F三点共线,且
,
.已知小明眼睛离地面的高度
,
,
,
,
.求路灯
的长.(平面镜的大小忽略不计,结果精确到0.1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e9c25368ddf0fda6a8dde70e3ac0eae.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f541f7ae7c39082d202efd28805c54e.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,先把一矩形
纸片对折,设折痕为
,再把
点叠在折痕线上,得到
.过
点折纸片使
点叠在直线
上,得折痕
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/4220cf92-54aa-4cb3-8002-6186a2fa59f7.png?resizew=267)
求证:
;
你认为
和
相似吗?如果相似,给出证明;若不相似,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a34a1a0354e836d4c88eeb7d2589283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da265da7dc8e40f22ac9eb76f8b3b4b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3686a991fb2ba017a6890bc6208e8a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6312c1b1ecc7cd8dd9c7fd5b603b47f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/4/4220cf92-54aa-4cb3-8002-6186a2fa59f7.png?resizew=267)
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