1 . 如图,
是等腰直角三角形,
是过点C的直线,
,
,则
与
通过下列交换:①绕点C旋转后重合:②沿
的中垂线翻折后重合:③沿
方向平移
后与
重合:④绕中点M逆时针旋转90度,则
与
重合;⑤先沿
方向平移
,使点E与点D重合后,再将平移后的三角形绕点D逆时针旋转90度,则
与
重合.其中正确的有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/d212a264-2f89-44f8-9a48-bcf344322a07.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21b405cbf01e3a08880eebe4af89da2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d5427b7b994b860628df3d6b7a07de8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fef102911f5b3465c2b95331afce934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fef102911f5b3465c2b95331afce934.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e3a9ec45721f7b4d1c99917ac0d970f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/1/d212a264-2f89-44f8-9a48-bcf344322a07.png?resizew=157)
A.1个 | B.2个 | C.3个 | D.4个 |
您最近一年使用:0次
2 . 如图,
,
,并且图中两个三角形全等,请写出与边
相等的对应边是_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b0fff774b4b0087a6f304ce930d359be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/29/dd51172a-731e-4f0b-ae36-c13d118e41fd.png?resizew=172)
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3 . 【阅读填空】如图1,已知:
,C,D是
外不在同一直线上的两点,探索
,
,
,
之间的数量关系.
解:分别过点C,D作
的平行线
,则
,
∴
(____________),
,
,
∴
.
【类比探究】如图2,在
中,证明:
;
【拓展提高】如图3,等边
中,D是
上一点,F是
延长线上一点,且
,猜想
和
的数量关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c34e584544620189df11083442fb2f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7d19f963f7c803bcfcbb265ec6d4304.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b871a762469393cdd22f15aa49ebb8f9.png)
解:分别过点C,D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96579f3acc96edd87311e1277ef606ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e73e0646d7d01cabe5abc5fcef2ec62.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae0385ae883348522ec21ad9d02251f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a34304ba2409491f2b0fda58292afefe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/184c8b2c88c3c601a14d5903fe47b191.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8d67b3e93ac23da5aff3dee30019299.png)
【类比探究】如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/791e819abbe4ecc6f2e7209839c4fc0b.png)
【拓展提高】如图3,等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/967578d2c4086aef3fda57ed4cdae5c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/25/af06ca7c-4b91-49de-9867-b44a8c0866b0.jpg?resizew=382)
您最近一年使用:0次
4 . 已知
中,
,直线l经过点A.如图,点D,E分别在直线l上,点B,C位于l的同一侧,若
,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a6d46ab920c6b3052f1249d9af2f5a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
您最近一年使用:0次
2024-02-20更新
|
48次组卷
|
3卷引用:山东省泰安市新泰市2023-2024学年七年级上学期期末数学试题
山东省泰安市新泰市2023-2024学年七年级上学期期末数学试题山东省泰安市新泰市2023-2024学年七年级上学期期末数学试题(已下线)专题4.25 三角形(全章分层练习)(基础练)-2023-2024学年七年级数学下册基础知识专项突破讲与练(北师大版)
5 . 几何学起源于土地测量,据史料记载,古希腊数学家泰勒斯发明了一种用帽子测量河流宽度的方法,具体操作步骤如下:
①如图,人垂直站立在河岸边上,视线与河岸边保持垂直;
②调整帽子,使视线通过帽檐正好落在对面的河岸边上;
③人保持姿势,转过一个角度,这时视线通过帽檐落在了自己所在岸的某一点上;
④测量该点与人站立位置的距离就是河流的宽度.
请用你学过的一个数学定理解释通过以上步骤能测得河流宽度的道理:________ .
①如图,人垂直站立在河岸边上,视线与河岸边保持垂直;
②调整帽子,使视线通过帽檐正好落在对面的河岸边上;
③人保持姿势,转过一个角度,这时视线通过帽檐落在了自己所在岸的某一点上;
④测量该点与人站立位置的距离就是河流的宽度.
请用你学过的一个数学定理解释通过以上步骤能测得河流宽度的道理:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/10/20e5c71a-a816-4792-944b-3c0ad29800e2.png?resizew=142)
您最近一年使用:0次
6 . 教育部颁布的《基础教育课程改革纲要》要求每位学生每学年都要参加社会实践活动,某学校社团组织了一次测量探究活动,测量校园内的小河的宽度,如图所示,小东和小颖在河对岸选定一个目标点A,在近岸取点
和
、
,使点
、
、
共线且河岸平行,
、
分别与河岸垂直且A、
、
三点共线,他们已测得
,河宽
的长为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7e7cb192edea779c1d9f8a78b9e7b95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
7 . 如图,已知点
为
的中点,
,若
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9017679ac1d4ce2ee98d240c458019e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50f218914337edd06e59e75d90b777e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/839f4888-5e47-4f56-a5f9-71d874806911.png?resizew=104)
您最近一年使用:0次
8 . 如图,相互平行的三条直线
,
,
,
与
,
与
之间的距离分别为1,3,若在三条直线上各取一点,构造一个等腰直角三角形,那么作出的等腰直角三角形面积最大值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9fce9427c9b17e4d3cda0c3ff3e2e14.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/31/3ddde589-b21f-4c18-99b1-8916305b18b8.png?resizew=148)
您最近一年使用:0次
名校
9 . 如图:正方形
中,直线
经过点D,与
交于点E,
的垂线
,垂足为G,交
于点F,(请保留作图痕迹,不要求写作图过程)
(2)同学们作图完成后,通过测量发现
,并且推理论证了该结论,请你根据他们的推理论证过程完成以下证明:
如图:已知正方形
中,
分别是直线
,直线
被一组对边截得的线段,当
时,求证:
.
证明:∵正方形
,
∴
,
∴
,
∴
,
∵
,
∴
,
∴ ② ,
∴
,
在
和
中,
,
∴
,
∴
.
同学们进一步研究发现,一条直线被正方形的一组对边所截得的线段与另一条直线被正方形的另一组对边所截得的线段垂直时均具备此特征,请你依据题目中的相关描述,完成下列命题:两条直线分别被正方形的一组对边所截,若所截得的线段 ④ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)同学们作图完成后,通过测量发现
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
如图:已知正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b795e2cfa58b494fd8f5437b3db0d1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e9b0f5f44abbc6544a2f672b025b013.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
证明:∵正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15416b74b2ecbcfa38cf34a9ffff730.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3abcbc36009f894519c6d465358de5d2.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/464a10f140976f4b63f793ff74c9d496.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f87b02b744534ae1ed700d21fcceb4.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d24b556e392436e0eb111d3c13c336e.png)
∴ ② ,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491b7a0cb6fb1af16947c7e06b749fe2.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63b43490ca09467a4c8cd8cfe91c94e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de5674c0eebfe39bafb7a37998f8bff6.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/911a4f78c778a5dd7aa3ba9dd8afaad3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1db2c0955e5a5be47faf855bca738a4.png)
同学们进一步研究发现,一条直线被正方形的一组对边所截得的线段与另一条直线被正方形的另一组对边所截得的线段垂直时均具备此特征,请你依据题目中的相关描述,完成下列命题:两条直线分别被正方形的一组对边所截,若所截得的线段 ④ .
您最近一年使用:0次
10 . 如图,
中,
于点
,点
为线段
,
上两点,满足
,则
的比值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4744b427f036dfbc6db68c87cd5c54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/10e23e7ab29e31bacfee7abce819b773.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91e1e4115d78e625e9e0f47cdade3286.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e0ae50d5993a332b5cddb022eaa6f1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c57c65fc5fa1f55766d25434890afa3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/179299c470bf5c52c2b9ab9b6b9d3c05.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
2024-01-21更新
|
69次组卷
|
4卷引用:浙江省绍兴市诸暨市2023-2024学年九年级上学期期末数学试题
浙江省绍兴市诸暨市2023-2024学年九年级上学期期末数学试题(已下线)九年级开学摸底考(浙江专用)02-2023-2024学年九年级数学下学期开学摸底考试卷2024年甘肃省武威市凉州区第二十一中学教研联片中考第一次模拟考试数学模拟预测题2024年甘肃省武威市凉州区中坝九年制学校联片教研二模数学试题