1 . 如图,在
中,
,
,点
在边
上,
于点
,交
于点
.若
,则
的长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4cb73e9d976cbfe9c590044fa69dd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d45306d45915a1eb96b4c62dad6df520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3bb34308698b377df58ef5441aeec76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edc5df62e8ac9c74a46462519b95479a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/7dced976-2fc0-41c2-900f-7b5cca2e2441.png?resizew=198)
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2 . 综合与实践:
操作发现:
如图1,在
纸片中,
,
于点
.
第一步:将一张与其全等的纸片,沿
剪开;
第二步:在同一平面内,将所得的两个三角形,和
拼在一起.如图2所示,这两个三角形分别记为
和
;
第三步:分别延长
和
相交于点
.
(1)求证:四边形
是正方形;
拓广探索:
(2)如图3,连接
分别交
,
于点
,在四边形
外作
,使得
,
,判断线段
,
,
之间的数量关系,并说明理由.
操作发现:
如图1,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73152c2b4298298c8b81dc16dc21f5e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
第一步:将一张与其全等的纸片,沿
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
第二步:在同一平面内,将所得的两个三角形,和
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54fb6e81fee5674c3e26a65e58cc506d.png)
第三步:分别延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/671c82d9-4652-46f5-8298-0fead9406a68.png?resizew=336)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
拓广探索:
(2)如图3,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72794bd3cbe1a898e2254c3dd98a437e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/507ed891293f5b9f54304df66ca05949.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad8bc7197ad41f3819d5e87ce74c7f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348fa9cc497f328c9dda7c4e0a624a3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/360496a4f5cc8a5faca5e089ae4f9531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/15/8d3840e6-990a-4094-9942-6f67f625123e.png?resizew=160)
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3 . 如图,有一架秋千,当它静止在
的位置时,踏板离地的垂直高度
为
m,将秋千
往前推送水平距离
为3m时到达
的位置,此时,秋千的踏板离地的垂直高度
为
m,秋千的绳索始终保持拉直的状态.求秋千
的长度,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/66577f4cb97c0d2a213ab1a9a02d1324.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3c8af0b2909df6ec5786c316662919c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/80a46cd4-8874-4f1e-a48d-9b26dc89edbf.png?resizew=424)
您最近一年使用:0次
2023-07-09更新
|
98次组卷
|
3卷引用:山西省朔州市右玉县教育集团初中部2022-2023学年八年级下学期7月期末数学试题
名校
4 . 如图,四边形
为菱形,
,
交于点O,E是
的中点,连接
并延长交
于点F.已知
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/7dea9a21-5ede-4918-9b9f-fd849cecd941.png?resizew=283)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/16/7dea9a21-5ede-4918-9b9f-fd849cecd941.png?resizew=283)
A.![]() | B.1 | C.![]() | D.![]() |
您最近一年使用:0次
2022-11-14更新
|
222次组卷
|
8卷引用:山西省朔州市右玉县右玉教育集团初中部2023-2024学年九年级上学期期中数学试题
5 . 如图,为了测量甲楼
的高度,由于甲楼的底部D不能直接到达,于是,测量人员在乙楼的顶部A测得甲楼的顶C的仰角是
,底部D的俯角是
,已知乙楼
的高度是12米,求甲楼
的高度.(参考数据:
,结果精确到0.1米)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/225803a7818b0985a1b96d8e0a627251.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99dec330a6a160e0dcdb1e178d9a214b.png)
![](https://img.xkw.com/dksih/QBM/2022/2/24/2923265097940992/2926145319608320/STEM/c966df6faa9946e29cbb44624ee7bbdf.png?resizew=90)
您最近一年使用:0次
2022-02-28更新
|
179次组卷
|
2卷引用:山西省朔州市山阴县2021-2022学年九年级上学期期末数学试题
6 . 综合与实践:
问题情境:在矩形ABCD中,点E为BC边的中点,将△ABE沿直线AE翻折,使点B与点F重合,直线AF交直线CD于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/fc643f7e-295c-42df-b549-abd288a05d9a.png?resizew=281)
特例探究 实验小组的同学发现:
(1)如图1,当AB=BC时,AG=BC+CG,请你证明该小组发现的结论;
(2)当AB=BC=4时,求CG的长;
延伸拓展:(3)实知小组的同学在实验小组的启发下,进一步探究了当AB∶BC=
∶2时,线段AG,BC,CG之间的数量关系,请你直接写出实知小组的结论:___________.
问题情境:在矩形ABCD中,点E为BC边的中点,将△ABE沿直线AE翻折,使点B与点F重合,直线AF交直线CD于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/28/fc643f7e-295c-42df-b549-abd288a05d9a.png?resizew=281)
特例探究 实验小组的同学发现:
(1)如图1,当AB=BC时,AG=BC+CG,请你证明该小组发现的结论;
(2)当AB=BC=4时,求CG的长;
延伸拓展:(3)实知小组的同学在实验小组的启发下,进一步探究了当AB∶BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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