如图1,在
中,
.用尺规作图,在线段
上作点D,使得
(不写作法,保留作图痕迹).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8db8cf0a-735f-4464-ad62-7a22973e26d3.png?resizew=240)
(1)如图2,小明的作法是:以点B为圆心,
为半径作弧,交
于点D,连接
.请你帮助小明说明这样作图的理由;
(2)请用另一种作法完成作图.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/093c6b5aeaa7e581ad4345e137c24c92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff29971ccc633d89832ffa9bd54afa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/12/8db8cf0a-735f-4464-ad62-7a22973e26d3.png?resizew=240)
(1)如图2,小明的作法是:以点B为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)请用另一种作法完成作图.
更新时间:2023-05-08 20:55:48
|
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解答题-作图题
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适中
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【推荐1】根据下列要求作(画)图,保留作(画)图痕迹,不写作(画)法.
(1)如图1,作
的角平分线
;
(2)如图2,在
的正方形网格中,每个小正方形的边长为
,小正方形的每一个顶点叫做格点.
的顶点都在格点上.请仅用无刻度直尺画出
的中线
.(保留画图过程痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/208d07bb-08f1-4dc3-bf40-95a212990253.png?resizew=252)
(1)如图1,作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd4be97adde17423d59d86d18318c2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
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解答题-作图题
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适中
(0.65)
【推荐2】如图,
是
的内接三角形,且
为直径.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f526fa49-0a72-4c4e-b11d-23ea45469a93.png?resizew=155)
(1)请用尺规作
的平分线,交
于点
;(不要求写作法,但需要保留作图痕迹)
(2)连接
,
,若
,
,求线段
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/3/f526fa49-0a72-4c4e-b11d-23ea45469a93.png?resizew=155)
(1)请用尺规作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/194741f4d2ae7ee44cafca780361446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1682d306c38087d9e6f7efb9cec596a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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解答题-作图题
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适中
(0.65)
名校
【推荐1】如图已知△ABC.
(1)请用尺规作图法作出BC的垂直平分线DE,垂足为D,交AC于点E, (保留作图痕迹,不写作法);
(2)请用尺规作图法作出∠C的角平分线CF,交AB于点F,(保留作图痕迹,不写作法);
(3)请用尺规作图法在BC上找出一点P,使△PEF的周长最小.(保留作图痕迹,不写作法).
(1)请用尺规作图法作出BC的垂直平分线DE,垂足为D,交AC于点E, (保留作图痕迹,不写作法);
(2)请用尺规作图法作出∠C的角平分线CF,交AB于点F,(保留作图痕迹,不写作法);
(3)请用尺规作图法在BC上找出一点P,使△PEF的周长最小.(保留作图痕迹,不写作法).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/325b70d3-24b4-43bf-b784-f1563bcb503a.png?resizew=167)
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解答题-作图题
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适中
(0.65)
名校
【推荐2】下面是小东设计的“作矩形”的尺规作图过程.
已知:
中,
.
求作:矩形
.
作法:如图,
的垂直平分线交
于点
;
②连接
并延长,在延长线上截取![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
③连接
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
所以四边形
即为所求作的矩形
根据小东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:∵
______,
,
∴四边形
是平行四边形(______)(填推理的依据).
∵
,
四边形
是矩形(______)(填推理的依据)
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
求作:矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
作法:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
所以四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
根据小东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:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a548e8a2e2205f2faa87e25180a083.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fce05f91ce17863abc8a5a8f6002b75.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)
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解答题-问答题
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适中
(0.65)
【推荐1】已知等腰三角形底边长为a,底边上的高的长为h,求作这个等腰三角形.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828305587855360/2828357851316224/STEM/37494ecd-7454-4ad0-8bee-70350e583a92.png)
作法:
(1)作线段
.
(2)作线段
的垂直平分线
,与
相交于点D.
(3)在
上取一点C,使
.
(4)连接
,则
就是所求作的等腰三角形.
![](https://img.xkw.com/dksih/QBM/2021/10/13/2828305587855360/2828357851316224/STEM/37494ecd-7454-4ad0-8bee-70350e583a92.png)
作法:
(1)作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d42e97eee705d164e6ac6de9ecd6d1f.png)
(2)作线段
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(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad28c1b207028b0e47a0f4e2f8f12be4.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e675a92cad72c65aa4071b9d9e226090.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在平面直角坐标系中,面积为9的正方形
的顶点B在反比例函数
的图像上,点A在
轴的正半轴上,以B为顶点作等腰三角形
,使底边DE在y轴上,且
,点E在点C的上方.
(1)求k的值;
(2)求四边形
的周长.
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(1)求k的值;
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0723beb54905fb68f5f459919da9547.png)
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解答题-作图题
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适中
(0.65)
【推荐2】(1)已知:线段a,∠α.求作:△ABC,使BC=a,∠C=∠B=∠α.(不写作法,保留作图痕迹)
(2)在(1)的图形中,如果BC=6
,∠α=30°,求△ABC的面积.
(2)在(1)的图形中,如果BC=6
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/22/da013497-6598-41f3-9dca-fd2ef4665c90.png?resizew=246)
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