如图,在已知的
中,按以下步骤作图:
(1)分别以
为圆心,以大于
的长为半径作弧,两弧相交于两点M,N;
(2)作直线
交
于点
,连接
.
若
,
,则
度数为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/21/7932df38-e693-4873-a784-c29c6a6ab589.png?resizew=156)
(1)分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d452f74791f58e8400cb8d2d6038dc4.png)
(2)作直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa29fe6cd9eb51c184f6299d437375cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ffb98f1e3c1317c0db403d3af04bdc.png)
若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fffc2a946e72f26a8af584d8ead3a396.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d777d15cd733338ecfd0ea63819f62c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fabb884dc5f9609de491245463bbe9a.png)
A.![]() | B.![]() | C.![]() | D.![]() |
更新时间:2024-02-21 14:03:28
|
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单选题
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【推荐1】如图,在
中,
,
,点D是
上一点,连接
,则
长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/deee6602-1141-483f-a532-8801f8c7f95e.png?resizew=188)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cc999161f71a84b371e574ef72deaad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/163f22cedcecefbe8a58a7e7a6b17e17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed503511366e09f528732f6e282dc715.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/23/deee6602-1141-483f-a532-8801f8c7f95e.png?resizew=188)
A.4 | B.5 | C.6 | D.8 |
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【推荐2】如图,在△ABC中,AB=AD=DC,∠BAD=20°,则∠C的度数为( )
![](https://img.xkw.com/dksih/QBM/2020/10/11/2568839538098176/2569894843670528/STEM/7e403768d48c4f83837862e12a4d670f.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/2020/10/11/2568839538098176/2569894843670528/STEM/7e403768d48c4f83837862e12a4d670f.png?resizew=164)
A.20° | B.40° | C.60° | D.80° |
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【推荐1】在平行四边形ABCD中,
,对角线
的垂直平分线交
于点
,连接
.若平行四边形ABCD的周长为20cm,则
的周长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/73e383c2-43b7-41f7-88e7-16bd6ae06673.png?resizew=174)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc4b17ce6e90cd3810a3696262e94c1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/3/73e383c2-43b7-41f7-88e7-16bd6ae06673.png?resizew=174)
A.20cm | B.40cm | C.15cm | D.10cm |
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【推荐2】如图1,
中,
,
为锐角.要用尺规作图的方法在对边
上分别找点M,N,使四边形
为平行四边形,现有图2中的甲、乙、丙三种方案,则正确的方案( )
甲:按照如图所示的方法,分别在
上确定点M,N.
乙:分别以点B,D为圆心,
长为半径作弧,交
于点N,M.
丙:在
上取一点N,使
,以点C为圆心,
长为半径作弧,交
于点M.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fe060a37a93ea736e9c3d444809cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b49da6ed5141fe911ec817d5f538bcd.png)
甲:按照如图所示的方法,分别在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83fe060a37a93ea736e9c3d444809cd0.png)
乙:分别以点B,D为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdcf86f7cf381c563ad80af86feeed83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b511eccad44ffbed4f9553e1cb1d1597.png)
丙:在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd53320a26135a7a99beb95e2dd4ce9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/26/b644e692-8cda-46b3-8a4c-e5b6635f3553.png?resizew=621)
A.只有乙、丙才是 | B.只有甲、丙才是 | C.只有甲、乙才是 | D.甲、乙、丙都是 |
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【推荐1】如图,在
中,分别以点A,B为圆心,大于
长为半径画弧,两弧相交于点E,F,连接
,作直线
交
于点M,连接
,则下列判断不正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/a1807f65-47a3-409b-a60a-84cee4382442.png?resizew=128)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20d49404351575703cfe8325d1352ec9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bba87bb6ab3a88f6d9529e01ce585a5d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/25/a1807f65-47a3-409b-a60a-84cee4382442.png?resizew=128)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,在
中,以点A为圆心,
的长为半径作圆弧交
于点D,再分别以点B和点D为圆心,大于
的长为半径作圆弧,两弧分别交于点M和点N,连接
交
于点E.若
的周长为15,
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c81613520ab5a478f0b2616a9bcb79d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f186ea827f7becafd1ac4955e22c6812.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
A.4 | B.8 | C.9 | D.10 |
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【推荐1】如图,将
绕点
顺时针旋转后得到
,且点
恰好落在边
上,若
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8ee6e1d480ece7117e1f87ebf4bbeea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6988b81937a2b98659c359d9ed686146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15e42d1daecdb9d0c2a12c47eba82868.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/12/df9016c0-681c-46df-bc9d-c3b75947d05c.png?resizew=195)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,将
绕点B逆时针旋转
得
,点D,E分别为点A,C的对应顶点,连接
,若
,
为50°,则旋转角
为( )
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096992496189440/3098844716113920/STEM/2bf60dc68be54a56b7974d9bac03f09a.png?resizew=201)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/685516a27697104e83b311d76efa17aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/10/27/3096992496189440/3098844716113920/STEM/2bf60dc68be54a56b7974d9bac03f09a.png?resizew=201)
A.![]() | B.![]() | C.![]() | D.![]() |
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