如图,菱形
对角线交于点
,
,
,
与
交于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7deae45a-e1bc-48c1-84e9-5c75b8496e5d.png?resizew=200)
(1)求证:四边形
是矩形;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83b5d737d39e5ea753c6c824dd964751.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684d328b02462aa25a936d1c83eee4fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f90c780dac29ff8b7df5881d3b33abab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/17/7deae45a-e1bc-48c1-84e9-5c75b8496e5d.png?resizew=200)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e20e9d6c7e003d1a312b722e5e7fd4c5.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eca7e1a727ba332984ad857b3d25344d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
更新时间:2022-10-14 19:54:52
|
相似题推荐
解答题-证明题
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【推荐1】如图,四边形
中,
,
相交于点O,O是
的中点,
.
![](https://img.xkw.com/dksih/QBM/2023/7/6/3275119516483584/3275716407173120/STEM/ae094e2da93b4b9b9183c7a7fa5f0fc5.png?resizew=145)
(1)请你添加一个条件(不另加辅助线)要使四边形
是矩形,还添加的一个条件是_________;
(2)求证:四边形
是矩形.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://img.xkw.com/dksih/QBM/2023/7/6/3275119516483584/3275716407173120/STEM/ae094e2da93b4b9b9183c7a7fa5f0fc5.png?resizew=145)
(1)请你添加一个条件(不另加辅助线)要使四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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【推荐2】阅读下面材料:
在数学课上,老师提出如下问题:
小明的思考过程是:
小明的作法如下:
请你根据小明同学设计的尺规作图过程:
(1)使用直尺和圆规,依作法在图1中补全图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线
是
的垂直平分线,
∴
,
∵
,
∴四边形
是平行四边形( ① )(填推理的依据).
∵
,
∴四边形
是矩形( ② )(填推理的依据).
(3)参考小明的作图思路,另外设计一种作法,利用直尺和圆规在图2中完成.
(温馨提示:保留作图痕迹,不用写作法和证明)
在数学课上,老师提出如下问题:
已知:如图,在![]() ![]() 求作:矩形 ![]() ![]() |
(1)由于求作矩形,回顾了矩形的定义和判定: 矩形的定义:有一个角是直角的平行四边形叫做矩形; 矩形判定1:对角线相等的平行四边形是矩形; 矩形判定2:有三个角是直角的四边形是矩形. (2)条件给出了 ![]() (3)小明决定通过作线段AC的垂直平分线,作出线段 ![]() ![]() |
作法:(1)分别以点A,C为圆心,大于![]() (2)作直线 ![]() ![]() ![]() (3)作射线 ![]() ![]() ![]() ![]() (4)连接 ![]() ![]() ∴ 四边形 ![]() ![]() |
(1)使用直尺和圆规,依作法在图1中补全图形(保留作图痕迹);
(2)完成下面的证明:
证明:∵直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)参考小明的作图思路,另外设计一种作法,利用直尺和圆规在图2中完成.
(温馨提示:保留作图痕迹,不用写作法和证明)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/29/3a64ab36-5bab-4434-ac37-09303ad2e026.png?resizew=151)
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【推荐1】如图,已知菱形
的对角线
相交于点
,点
是菱形外一点,且
,连接
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989c75a3fd02e4971cab421c88de92f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43584c5a2f6ab7d24e73e0f0c1f82413.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cede2006bf19da5ae1c126da517ce79c.png)
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【推荐2】图1是新冠疫情期间测温员用“额温枪”对居民李阿姨测温时的手绘图,图2是其侧面示意图,其中枪柄
和手臂
始终在同一条直线上,额头为F,枪身
与身体
保持垂直,量得胳膊
,肘关节B与枪身端点E之间的水平宽度为
(即
的长度),枪身
.
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985594568654848/2989380645134336/STEM/a3be8a91-3107-4ee4-9b7d-d370bfcf29d0.png?resizew=333)
(1)求
的度数.
(2)根据疫情防控相关操作要求,规定测温时枪身端点E与额头F之间的距离需在
到
之间.若
,李阿姨与测温员之间的距离为
.求此时枪身端点E与李阿姨额头F之间的距离,并判断测温枪与额头之间的距离是否在规定范围内,说明相应理由.(结果保留小数点后两位,参考数据:
)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632917e61f4208959686d118c7f19231.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31273be5eb5cd1f805c7c394d10cc7a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc81de95f1ae2d938ae326e265b3e184.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0189bd10ca1151db4cbc7f02d05beb11.png)
![](https://img.xkw.com/dksih/QBM/2022/5/23/2985594568654848/2989380645134336/STEM/a3be8a91-3107-4ee4-9b7d-d370bfcf29d0.png?resizew=333)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/903ec50474ddc02e78fb21af16e84bf2.png)
(2)根据疫情防控相关操作要求,规定测温时枪身端点E与额头F之间的距离需在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32d8c72088c5ebef12ba11a92d6d1ee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9938aea41f03701b233dee15809f2126.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1bcc960364ba71da42fcab71795ab5e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2d811becb6eaa3a05790a957fc2bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334775d18579842f93e580d600cda090.png)
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【推荐1】如图,在菱形ABCD中,过点A作AE⊥BC,
,垂足分别为E、F.求证:AE=AF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fbee06d305abf6692125513dc3757f9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/b2d1700a-4f7c-4e99-88bb-1c52743f2917.png?resizew=155)
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【推荐2】如图,在菱形
中,对角线
,
相交于点O,过点B作
,且
,连接
,求证:四边形
是矩形.
![](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/cccde778c619848076ea8c11b0b13a12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3b17682bbb65031fee3e40bc21f625e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c7a93d3c9e0994b2e45ae895c352c47.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/11/a26e86e5-9c49-490a-9369-7beb8f0e02e3.png?resizew=205)
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