![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c15514bc735fe4b744672edefe00009c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a65183d238c9bc2be73770717d890683.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/28d28b62b82aba68a82d25ca777016f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/824ccc27-283d-44f7-9e15-fc148a56a3df.png?resizew=166)
A.![]() |
B.![]() |
C.![]() ![]() |
D.![]() ![]() ![]() ![]() |
更新时间:2022-11-13 14:42:09
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【推荐1】如图,OA=OB,OC=OD,若∠O=45°,∠C=30°,则∠OBD等于( )
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096877842604032/2098139037933568/STEM/e1194574dc654066af2ba9f9ab4d8dd2.png?resizew=74)
![](https://img.xkw.com/dksih/QBM/2018/12/14/2096877842604032/2098139037933568/STEM/e1194574dc654066af2ba9f9ab4d8dd2.png?resizew=74)
A.75° | B.105° | C.90° | D.120° |
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【推荐2】如图,
,
,动点C从点O出发,沿射线OB方向移动,以AC为边在右侧作等边
,连接BD,则BD所在直线与OA所在直线的位置关系是( )
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084827292418048/3087977103990784/STEM/f62b05db26b74e338de1b763558b0459.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc1eb76fe74cba30f7cbcde349ba80da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cba47906b1c55990f2c0ca31d656b774.png)
![](https://img.xkw.com/dksih/QBM/2022/10/10/3084827292418048/3087977103990784/STEM/f62b05db26b74e338de1b763558b0459.png?resizew=140)
A.平行 | B.垂直 | C.相交但不垂直 | D.相交或者平行 |
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【推荐1】如图,在边长为2的等边
中,D是
边上的中点,以点A为圆心,
为半径作圆与
,
分别交于
两点,则图中阴影部分的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41a460f95e8ebabac97d572fecea8fb0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/24/741b159c-e624-4db5-8cf4-35dda56dc018.png?resizew=111)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,
是等边三角形,点
是
下方的一点,
,
,点
和点
分别是
和
上一点,
.若
的周长为12,则
的周长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bcf905f3910d9238a44ef647835b3d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/532aece6cfd67e2a97977eed978dbf2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.5 | B.6 | C.8 | D.9 |
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【推荐1】下列各图中,既可经过平移,又可经过旋转,由图形①得到图形②的是( )
A.![]() | B.![]() |
C.![]() | D.![]() |
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【推荐2】下列四个图案是小明家在瓷砖厂选购的四种地砖图案,其中既可用旋转来分析整个图案的形成过程,又可用平移来分析整个图案的形成过程的是( )
A.![]() | B.![]() | C.![]() | D.![]() |
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