已知:如图,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/09b215c0-81eb-49ae-acf6-a6c4445a213f.png?resizew=119)
求作:线段
,使得
.
作法:①分别以点
和点
为圆心,大于
长为半径作弧,两弧分别交于点
和点
;
②作直线
,交
于点
;
③连接
.
所以线段
即为所求作的线段.
(1)使用直尺和圆规,依作法补全图形.(保留作图痕迹)
(2)完成下列证明:
证明:
是线段
的垂直平分线,
(____________).(填写推理依据)
___________°.
,
.
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73152c2b4298298c8b81dc16dc21f5e7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/09b215c0-81eb-49ae-acf6-a6c4445a213f.png?resizew=119)
求作:线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70734a8e672376bb0bd1522e229f86a2.png)
作法:①分别以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
②作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
所以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)使用直尺和圆规,依作法补全图形.(保留作图痕迹)
(2)完成下列证明:
证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26efaff579cd0b6151c68225fafb5720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71b69adc1aff19a9b4277c46d471ec12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f5fc826de09e821b1270c9cf263debb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27577a66208b3aad061b9b8a61de210b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d69937cad6b136a6dce0e29c6a423f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/957540a08156ec1a44cf5a1e50a1e462.png)
更新时间:2024-01-12 15:29:14
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解答题-证明题
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【推荐1】如图,在
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,
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【推荐2】如图,
,
,点
在
的垂直平分线上.
(1)
,
,
有什么数是关系?请说明理由.
(2)求证:
.
(3)若
,
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的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b5f215a42c4b7078d8d65923eb9980e.png)
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ac9591e73360e435109183f18e0d99d.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
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解答题-作图题
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名校
【推荐1】如图,一辆汽车在直线形的公路上由A向B行驶,M,N分别是位于AB两侧的村庄.
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(1)设汽车行驶到公路AB上点P的位置时,距离村庄M最近,行驶到点Q的位置时,距离村庄N最近,在图中的公路AB上分别画出点P,Q位置.
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解答题-问答题
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【推荐1】如图1是超市的手推车,如图2是其侧面示意图,已知前后车轮半径均为
,两个车轮的圆心的连线
与地面平行,测得支架
,
、
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、
,
.
(1)求扶手前端
到地面的距离;
(2)手推车内装有简易宝宝椅,
为小坐板,打开后,椅子的支点
到点
的距离为
,
,
,
,求坐板
的宽度.(本题答案均保留根号)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3a9eed64d225267a58cd001db67e2a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6b03eb5ca0b63f04b7e5e9a0ba455d.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/24/e69abe4f-f1c3-4929-ae76-da90f7852418.png?resizew=220)
(1)求扶手前端
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)手推车内装有简易宝宝椅,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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解答题-问答题
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【推荐2】如图,矩形
中,
,
,点
在
上,点
在
边上,
平分
.
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479466994155520/2480124149768192/STEM/8db9bff7-cc83-4d61-82b1-e87e1ee6d001.png?resizew=172)
(1)判断
的形状,并说明理由;
(2)若点
是
的中点,求
的长.
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(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-作图题
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【推荐3】小红发现,任意一个直角三角形都可以被分割成两个等腰三角形.
已知:在
中,
.
求作:直线
,使得直线
将
分割成两个等腰三角形.
下面是小红设计的尺规作图过程,
作法:①作
的垂直平分线
,交斜边
于点D;②作直线
,则直线
就是所求作的直线.
根据小红设计的尺规作图过程.
(1)使用直尺和圆规,补全图形(保留作图痕迹);
(2)完成下面的证明.
证明:∵直线
是线段
的垂直平分线,点D在直线
上,
∴
.(①__________________)(填推理的依据)
∴
.(②_________)(填推理的依据)
∵
,
∴
.
∴
.
∴
.(③_________)(填推理的依据)
∴
和
都是等腰三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/11/daef0de3-8065-49a6-9354-15a947b54949.jpg?resizew=148)
已知:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
求作:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
下面是小红设计的尺规作图过程,
作法:①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
根据小红设计的尺规作图过程.
(1)使用直尺和圆规,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/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93b5d552bf92224ac9332e93741fcfb8.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53e5357c1d8b14eb70ee029d2634db9d.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73eb195644ec055ccd3352de2a6443a7.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a428e02d1fa1937504356b929fc256d.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d103d10df3c1ac5fb0e9bfa07953b7a.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41f0dadf037efedc90b39c57a6880a1a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b93f77fc658b1f307566bb05d6d629fb.png)
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