如图,用直尺和圆规作“一个角等于已知角”的原理是:因为
,所以
.由这种作图方法得到的
和
全等的依据是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da5b20516552fea23a61052e4839537a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40739e44a6759ab1a5524e2f8e3a2280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/566e4c5c867260fba2d9fcf874d28164.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96bcaab1157f577919c7abc73a66ebd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/30/6bc7949e-7ea3-4152-9f2f-d982d21e14c4.png?resizew=278)
A.![]() | B.![]() | C.![]() | D.![]() |
16-17八年级·浙江温州·期中 查看更多[5]
浙江省温州市鹿城区第二十三中学2017学年H上八年级期中考试卷(已下线)中考考点总动员 考点29 尺规作图浙江省宁波市奉化区溪口中学、尚田中学等五校2019-2020学年八年级上学期期中数学试题(已下线)【新东方】【宁波】【初二上】【数学】【00020】河北省石家庄市栾城区2023-2024学年八年级上学期期中数学试题
更新时间:2021-04-29 22:28:39
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【知识点】 结合尺规作图的全等问题(全等三角形的判定综合)
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【推荐1】已知:
.求作:
,使
.
作法:(1)如图,以点
为圆心,任意长为半径画弧,分别交
,
于点
,
;
(2)画一条射线
,以点
为圆心,
长为半径画弧,交
于点
;
(3)以点
为圆心,
长为半径画弧,与第2步中所画的弧相交于点
;
(4)过点
画射线
,则
.
这种作一个角等于已知角的方法的依据是( )
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106881955192832/3147793710440448/STEM/bdea3eec680e4bdba53cf5d0d0c53c4d.png?resizew=301)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e3d51307daa0cfab77eec9311d91bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
作法:(1)如图,以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)画一条射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b48e33eaa40d01f976230d4b73ae91dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
(3)以点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c8a9c4957431681ddfc77895a88508.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
(4)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5b3bd5e6bc2a0a277d279bb01af9584.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6637859805b7b01f7a9a64771563406e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27949b9eac364001ddbd7ec0ef2e0142.png)
这种作一个角等于已知角的方法的依据是( )
![](https://img.xkw.com/dksih/QBM/2022/11/10/3106881955192832/3147793710440448/STEM/bdea3eec680e4bdba53cf5d0d0c53c4d.png?resizew=301)
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