已知线段
(如图),根据下列要求,依次作图.
,使它等于
;
(2)用圆规和直尺作线段
的中点
.(注意保留作图痕迹,并写好结论)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632244ea6931507f8656e1cc3437d392.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754826457671db8939098215943e656a.png)
(2)用圆规和直尺作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
更新时间:2024-05-23 09:57:27
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解答题-作图题
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【推荐1】如图,已知线段
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解答题-作图题
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【推荐2】如图,在矩形
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【推荐1】数轴上,已知
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【推荐2】如图,线段
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解答题-作图题
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【推荐1】如图,在△ABC中,∠B=30°,∠C=40°.
(1)尺规作图:①作边AB的垂直平分线交BC于点D;
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(2)在(1)所作的图中,求∠DAE的度数.
(1)尺规作图:①作边AB的垂直平分线交BC于点D;
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(2)在(1)所作的图中,求∠DAE的度数.
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解答题-作图题
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较易
(0.85)
【推荐2】请完成以下作图和填空:
如图,在
中,
为
的直径,
为
的弦,点
是
的中点.
尺规作图:过点
作
的垂线交
于点
,垂足为点
,连接
、
.(只保留作图痕迹)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/bc71fe5f-8e9c-4521-b2da-346e683ce43c.png?resizew=167)
求证:
.
证明: ∵点E是
的中点
∴
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2dc43da399974bd1df3b93f4e3104.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85b76335da132aae0a00587cc0d980c.png)
∵
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b40d65f77afa7e51a0f3e5b38f628.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dece4378e703f9654c81d3cd083b599.png)
∴
∴
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d24eae99b6dba16a45b58a6ff327a7b.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52957bb1727c575b3cf8678a09db500c.png)
∴
∴
.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
尺规作图:过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a299d2b999568e80be8005565ba209a4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/18/bc71fe5f-8e9c-4521-b2da-346e683ce43c.png?resizew=167)
求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ea7de08b6f98a9a9b28f983052f3c6.png)
证明: ∵点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667349d99185bb045030b733352ff7fd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975fe31b3d4f552faabb68c4c40881e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fd2dc43da399974bd1df3b93f4e3104.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c85b76335da132aae0a00587cc0d980c.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fab827ebee09efe2dee1d7b6a4d6884.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/549b40d65f77afa7e51a0f3e5b38f628.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dece4378e703f9654c81d3cd083b599.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6217ba54baf35aca59d9b89ded7367e.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/975fe31b3d4f552faabb68c4c40881e3.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d24eae99b6dba16a45b58a6ff327a7b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52957bb1727c575b3cf8678a09db500c.png)
∴
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41ea7de08b6f98a9a9b28f983052f3c6.png)
您最近一年使用:0次