如图,是四个基本作图的痕迹,下列关于①、②、③、④四条弧的说法正确的是( )
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990556812460032/2990575484682240/STEM/8568421f-a472-4bc7-911f-a56762cacd4f.png?resizew=633)
![](https://img.xkw.com/dksih/QBM/2022/5/30/2990556812460032/2990575484682240/STEM/8568421f-a472-4bc7-911f-a56762cacd4f.png?resizew=633)
A.弧①是以O为圆心,![]() |
B.弧②是以P为圆心,任意长为半径所画的弧 |
C.弧③是以A为圆心,任意长为半径所画的弧 |
D.弧④是以P为圆心,任意长为半径所画的弧 |
2022·河北·一模 查看更多[2]
更新时间:2022-05-30 15:24:18
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【推荐1】如图,在
中,按下列步骤作图:
第一步:在
上分别截取
,使
;
第二步:分别以E,F为圆心,适当长(大于
的一半)为
半径画弧,两弧交于点M;
第三步:作射线
交
于点D;
第四步:过点D作
于点P.
下列结论一定成立的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/3dd171a2-f5e0-4ab7-980b-65565abbc3b7.png?resizew=182)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
第一步:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c561465e9999219eb8b06c02c53e729.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
第二步:分别以E,F为圆心,适当长(大于
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
半径画弧,两弧交于点M;
第三步:作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
第四步:过点D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c8e6c6a7c096d0ccb79fa0e2458ce2.png)
下列结论一定成立的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/23/3dd171a2-f5e0-4ab7-980b-65565abbc3b7.png?resizew=182)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
的内切圆(圆心为点O)与各边分别相切于点D,E,F,连接
,
.以点B为圆心,以适当长为半径作弧分别交
于G,H两点;分别以点G,H为圆心,以大于
的长为半径作弧,两条弧在
的内部交于点P;作射线
.给出下列结论:
①射线
一定过点O;
②点O是
三条中线的交点;
③点O是
三条边的垂直平分线的交点;
④点O是
三条边的垂直平分线的交点.
其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2023/7/29/3291328675790848/3291559245119488/STEM/53faf16689724b35b416db386c161d32.png?resizew=157)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbee8d28b8596c00aef1c762f069ddbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/667f534c3893e5dcfe16be356202971a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f01b7488c22afe63b1b80e27169bfdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
①射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
②点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
③点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
④点O是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
其中正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2023/7/29/3291328675790848/3291559245119488/STEM/53faf16689724b35b416db386c161d32.png?resizew=157)
A.0 | B.1 | C.2 | D.3 |
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【推荐1】在如图所示的尺规作图中,与
相等的线段是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/2c2d6990-8e4a-4e5b-8067-6abebab34562.png?resizew=146)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/2c2d6990-8e4a-4e5b-8067-6abebab34562.png?resizew=146)
A.线段![]() | B.线段![]() | C.线段![]() | D.线段![]() |
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【推荐2】如图,在△ABC中,∠C=30°,分别以点A和点C为圆心,大于
AC的长为半径画弧,两弧相交于点M,N,作直线MN,交BC于点D,连接AD,若∠BAD=45°,则∠B的度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
A.75° | B.65° | C.55° | D.45° |
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