小聪在用直尺和圆规作一个角等于已知角时,具体过程是这样的:
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
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/3f423e69-e1ba-4b98-b343-66386046cd1d.png?resizew=217)
小聪作法正确的理由是( )
已知:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
求作:
![](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)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/7/3f423e69-e1ba-4b98-b343-66386046cd1d.png?resizew=217)
小聪作法正确的理由是( )
A.由![]() ![]() ![]() |
B.由![]() ![]() ![]() |
C.由![]() ![]() ![]() |
D.由“等边对等角”可得![]() |
21-22八年级上·北京·期中 查看更多[7]
北京市八一学校2021-2022学年八年级上学期期中数学试题2020-2021学年北京市海淀区八年级(上)期末数学试卷河南省南阳市新野县2021-2022学年八年级上学期期末数学试题河南省许昌市禹州市2021-2022学年八年级上学期期末数学试题北京市第十九中学2023-2024学年八年级上学期期中数学试题山东省临沂市沂水县2023-2024学年八年级上学期期中数学试题(已下线)第1章 全等三角形全章复习攻略(2个概念1个性质1个判定2个作图2个解题技巧1个应用3种思想)与检测卷
更新时间:2021-11-07 22:32:17
|
【知识点】 全等的性质和SSS综合(SSS)解读
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