名校
1 . 如图,在
中,
是对角线.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/7e1b24fe-797b-4a55-933c-1c1acfe399ed.png?resizew=182)
(1)尺规作图:作线段
的垂直平分线
,分别交
、
、
于点
、
、
,连接
和
(用尺规作图,并在图中标明相应的字母,保留作图痕迹);
(2)在(1)的条件下,求证四边形
是菱形(请补全下面的证明过程,将答案写在答题卡对应的番号后).
证明:∵
垂直平分
,
∴
.
又∵四边形
是平行四边形,
∴①________
∴
.
在
和
中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb286a47dbde46677a8619f548d5c151.png)
②________
∴
,
∴③________
∵
垂直平分
,
∴
,④________
∴
,
∴四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/26/7e1b24fe-797b-4a55-933c-1c1acfe399ed.png?resizew=182)
(1)尺规作图:作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
(2)在(1)的条件下,求证四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
又∵四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∴①________
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf6e5c05ccd9a271f2f253a053502615.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c525358262126a51fbb598d58f3e1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74625390340982140e449e07663579a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb286a47dbde46677a8619f548d5c151.png)
②________
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a49fc8b7061e74c854ae12908a95b0.png)
∴③________
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671eab9d0b5621d93972b7e62b816766.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bdae3d30abf70515bdbd45f9d0c380.png)
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2 . 定义:两组邻边分别相等的四边形是筝形.在第9章中我们学习了几种特殊四边形,请你根据已有的研究经验来探究筝形的性质.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/2c09b0ac-13ff-428b-b023-1644fe46d30b.png?resizew=442)
(1)【性质探究】通过观察、测量、折叠、证明等操作活动,对如图1的筝形
的性质进行探究.在①
;②
;③
垂直平分
;④
平分
和
;⑤
中一定正确的有___________.(填序号).
(2)【性质应用】如图2,在筝形
中,
,点
是对角线
上一点,过
分别作
的垂线,垂足分别为点
.求证:四边形
是筝形.
(3)【思维拓展】如图3,在筝形
中,
,求筝形
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/2c09b0ac-13ff-428b-b023-1644fe46d30b.png?resizew=442)
(1)【性质探究】通过观察、测量、折叠、证明等操作活动,对如图1的筝形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5958e9c38f23a6a92c527390345f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7de966c316db1013defc56372fcf814e.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/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9eb34d917a073024625616e4edf22016.png)
(2)【性质应用】如图2,在筝形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e36dc59be52ecb9d31f86a148e53ab43.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7835c72d14f9d61b95b15aa47fafac2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e87312e238ca347eeac14b92cc53b43.png)
(3)【思维拓展】如图3,在筝形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8976380b75571f53d0d981581235343.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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3 . 小明同学在学习过程中发现了一个命题:“如果三角形一边上的中线等于这条边的一半,那么这个三角形是直角三角形”,请按要求解决下列与此命题有关的问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/f9753cff-6490-4f00-b1d0-83bf612dc682.png?resizew=191)
(1)请用无刻度的直尺与圆规作出线段
(如图)的中点D,再找一点C,使得
, 连接
,
,得到
.(保留作图痕迹,不必写出作法)
(2)结合(1)中画出的图形,用符号表示此命题中的已知与求证,并给出证明.
已知:
求证:
证明:
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/f9753cff-6490-4f00-b1d0-83bf612dc682.png?resizew=191)
(1)请用无刻度的直尺与圆规作出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c71622531dfa894f21b2da123d020d24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)结合(1)中画出的图形,用符号表示此命题中的已知与求证,并给出证明.
已知:
求证:
证明:
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4 . 如图,在钝角
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/5784087f-8ccc-4bce-9e8c-6e25e5eda7a8.png?resizew=240)
(1)尺规作图:作
的垂直平分线,与边
、
分别交于点D、E(不写作法,不下结论,保留作图痕迹)
(2)在(1)的条件下,过点B作
交
的延长线于点H,连接
,求证
.请补完图形,并完成下列证明过程:
证明:∵
是
的垂直平分线(已知)
∴
① ,
,
∴ ② (等腰三角形三线合一)
∵
, ③
∴
(在同一平面内,垂直于同一条直线的两条直线平行)
∴
( ④ 填写文字依据)
∴
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29edec1f0ccd57a096fa9ef344d23568.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/20/5784087f-8ccc-4bce-9e8c-6e25e5eda7a8.png?resizew=240)
(1)尺规作图:作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)在(1)的条件下,过点B作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ad0a87392245e4bf5bafe26089803b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8b1d66af5b02eca0a171cc23dca1bf.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e2152ac6e0a9abe7378ca935fa593e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
∴ ② (等腰三角形三线合一)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68fbbd17c89f03dbb61cd6ffdb9a0344.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4e60c00c032756bceb4bf7a4d8dd516.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d282a919ded2068979ddaf2cc0e98b3b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec8b1d66af5b02eca0a171cc23dca1bf.png)
您最近一年使用:0次
2024-02-20更新
|
53次组卷
|
2卷引用:重庆市万州区2023-2024学年八年级上学期期末数学试题
5 . 问题呈现:证明命题:在直角三角形中,如果一个锐角等于30°,那么它所对的直角边等于斜边的一半.
已知:如图,在
中,
.
求证:
.
证明:如图,延长
至点D.使
,连接
.
(1)请根据提示,结合图形,写出完整的证明过程.
(2)结论运用:
①如图,小明在汽车上看见前面山顶上有一个气象站,此时测得水平线与视线的夹角为
,当汽车又笔直地向山的方向行驶4千米后,小明再看气象站,测得水平线与视线的夹角为
.那么这个气象站离地面的高度为______千米.
②如图,
为等边三角形,
相交于点P,
于点Q,
.求
的长.
已知:如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9de751eea06e785410d4d8fd3e78b96.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/d8873ddb-9142-48d3-aa4e-aab547c03f45.png?resizew=318)
证明:如图,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a1bf64ba772922fe58b5322eb4bced.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(1)请根据提示,结合图形,写出完整的证明过程.
(2)结论运用:
①如图,小明在汽车上看见前面山顶上有一个气象站,此时测得水平线与视线的夹角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/3a01e4ec-2131-422d-8999-1dccf18de423.png?resizew=496)
②如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ee7b9ec287a477a0fc846af876be66c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a77f2b19c52a8ef7d6d0cbdc43da861d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a11d23afda422cd8af1214beb527780.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/9b0e8b26-8e8f-4087-9e69-9fde55189cfa.png?resizew=164)
您最近一年使用:0次
名校
6 . 教材呈现:如图是华师版八年级上册数学教材第94页的部分内容.
请根据所给教材内容,结合图①,写出“线段垂直平分线的性质定理”完整的证明过程.
定理应用:
(1)如图②,在
中,
、
的垂直平分线分别交
于点
、
,垂足分别为
,
,已知
的周长为20,则
的长为__________.
(2)如图③,在
中,
,
,
、
分别是
、
上任意一点,若
,
,
,则
的最小值是__________.
2.线段垂直平分线 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴.如图13.5.1,直线 ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() 线段垂直平分线的性质定理 线段垂直平分线上的点到线段两端的距离相等. 已知:如图13.5.1, ![]() ![]() ![]() ![]() ![]() ![]() 分析 图中有两个直角三角形 ![]() ![]() ![]() |
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/449e0f3e-25f0-4b06-ba6d-cf363eed0870.png?resizew=741)
请根据所给教材内容,结合图①,写出“线段垂直平分线的性质定理”完整的证明过程.
定理应用:
(1)如图②,在
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
(2)如图③,在
![](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/8b5f215a42c4b7078d8d65923eb9980e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04ee826937d2add7a93aaa1422f8b736.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bb41f8ded9116e83f87a8e43b0ce7f8.png)
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7 . 我们已经知道线段是轴对称图形,线段的垂直平分线是线段的对称轴.如图,直线
是线段
的垂直平分线,P是
上任一点,连接
.将线段
沿直线
对折,我们发现
与
完全重合,由此即有:线段垂直平分线的性质定理:线段垂直平分线上的点到线段两端的距离相等.
已知:如图,
,垂足为点C,
,点P是直线
上任意一点.
求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
分析图中有两个直角三角形
和
,只要证明这两个三角形全等,便可证得
.
(1)以上是华师版八年级上册数学教材第94页的部分内容,请结合以上分析、利用图1写出“线段垂直平分线的性质定理”完整的证明过程.
(2)定理应用:如图2,在
中
,
的垂直平分线交
与点N,交
于点M,连接
,若
,
的周长是
.
①求
的长
②点P是直线
上一动点,在运动的过程中,
的周长是否存在最小值?若存在,标出点P的位置,并求出此时
的周长;若不存在,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5e58e5a299e7b6b508c61244b93ae1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f479d987bc7abd828c64f9dc745836ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/42015f30-0ad8-4203-b8ca-bf50b1542597.png?resizew=112)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
分析图中有两个直角三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf4c26f3f4d96117f087400a0f32ece8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aeb5255e2159617505e0c87d01437a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e4d19bf237a6fca67e0d01a9ddb726.png)
(1)以上是华师版八年级上册数学教材第94页的部分内容,请结合以上分析、利用图1写出“线段垂直平分线的性质定理”完整的证明过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/ee34c2e8-7fc7-4779-834a-43ac80f03c78.png?resizew=109)
(2)定理应用:如图2,在
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.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/8e5c62f22d7afc5627fcb86599faa8e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cd4a1c8087ef697d82b321a3331211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa87e5b49076f307a135bb2f63fa61d.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/15/e0767f00-8f69-4826-bb02-b8056b4a8541.png?resizew=104)
②点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
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8 . 如图,在
中,
平分
交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4f170d67-72fa-4e13-baf7-54751e36a405.png?resizew=242)
(1)用尺规完成以下基本作图:过点
作
于点
,交
于点
,连接
;(不写作法,不下结论,保留作图痕迹)
(2)求证:
,请根据下列证明思路完成填空:
证明:
____________,
.
于点
,
(____________)
在
和
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229ad9e4aa38b247f1abf8f938280852.png)
(____________).
____________
是线段
的垂直平分线
(____________)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4f170d67-72fa-4e13-baf7-54751e36a405.png?resizew=242)
(1)用尺规完成以下基本作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d6b98ecb4793c9f063f1f6b61caa19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ad98ad714864041a632ca949308e417.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/113bffa74ac1e976a5c468ccde2dc860.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f75cd01b3689408ebb2bcea4b25f6f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d257e50f224710383ad7a1b2da603d4.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48d671ea595b1a638992a531471ab47c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/022f0dc17db5fcc83b204dc845447ffc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/229ad9e4aa38b247f1abf8f938280852.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b87d978d02e1ccc8112746d456dcbab7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56577eaa2f4ed14e6e4330a801a59293.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a860c6ab2c48b1c458f54fdb23fa8bd.png)
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9 . 已知,如图,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/a14638de-6158-4b6c-b190-9b54f40266f1.png?resizew=147)
(1)用尺规完成以下基本作图,作线段
的垂直平分线,交
于
,交
于
,连接
(不说明理由,不下结论,只保留作图痕迹).
(2)在(1)所作的图形中,求证:
.
涵涵的思路是这样:由垂直平分线的性质得到
,从而得到
,再证明
,从而得到
,最后由等量代换可得
.请根据这个思路补全下面的证明过程.
证明:
直线
是线段
的垂直平分线
①_______,
②_______,
,
,
③_______
,
,
④_______,
,
⑤_______,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c62b53d8bf190fec68780760a0abf6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/15/a14638de-6158-4b6c-b190-9b54f40266f1.png?resizew=147)
(1)用尺规完成以下基本作图,作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)在(1)所作的图形中,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
涵涵的思路是这样:由垂直平分线的性质得到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd260fb9d772c122dcb1df52cbe38ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/897c3bec4b7e2be338c6faf41442f27d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f57cb0d726cc25a350dc792b539ff2f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a3a6dcaf9f9e9a940b4a16f7ec2fc2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcc1a8e1de618493faf62d1e75638a49.png)
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16f3d198e76391779fa3badc848c8ac8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f96d400f5d5f0a40f17048dc0fa480.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c435479c550284ac5efe46c903cabf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6808b55943e0ab815da922bf1b095e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c703ae2d0e1ee513be258e74591de40.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b71ce56e2fc5d86da9e55aee4ec50719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd8b904875a181c2b29d3cd8e0c5d7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b9132da6876ce3c9bbdfa72685b56fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1abe737bbb163965180279b0fcb1da27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b48d65c6d7eb6853a644642307ee3d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c8507788be312503cc9ac63178c60c.png)
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名校
10 . 如图,已知四边形
中,
为
边上一点,连接
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/57413150-be9b-4eda-bf84-0ad1e2dfcede.jpg?resizew=170)
(1)用直尺和圆规完成以下基本作图:过点
作
的垂线交
于
(保留作图痕迹);
(2)在(1)的条件下,若
,
,
为
的角平分线.
求证:
.完成下列填空.
证明:∵
,
,
①____________,
,
为
的角平分线,
,
②____________,
,
,
即:③____________,
∴
④____________,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/20/57413150-be9b-4eda-bf84-0ad1e2dfcede.jpg?resizew=170)
(1)用直尺和圆规完成以下基本作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
(2)在(1)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e472dea21dbfb4ab929e970d4bcbcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cd9f2ab635fbcde5f49a7919fe0b8a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38968daa1e0f0a5caceb3ede903105ad.png)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f7de19ceb054d778b94d849337d8a02.png)
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e472dea21dbfb4ab929e970d4bcbcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d8cbe6e341b308d8551751e2c6b3c65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671c73a48dfce4894545ae665b17f77d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c38ffc474f45993a7ed1e3cd5da75a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579b7a12dffd2b0be7ad5fa4ec9106e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2de0d10ef8b748d4531250c37c5d3f9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0eccaabe3cd78d3974282019505fb9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/353ab7837467b911fcc5983af6339793.png)
即:③____________,
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a8a9dedc0ea544bcdc304a6f6016aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0268b7417bbdd8a53d0659399a6a8317.png)
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