如图,等腰
中,
,
绕点
逆时针旋转60度后得到
(点
对应点
).
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/a6656ee6-4b00-4b86-928a-0284e4b7758f.png?resizew=172)
(1)尺规作图:请作出
,并连接
(保留作图痕迹,不写作法);
(2)在(1)所作的图中,若
、
、
在同一直线上,且点
是
的中点.证明:四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb37498f5ef5a2ede672dc9ad5275ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7189182cc23d759be2764d141952737b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/24/a6656ee6-4b00-4b86-928a-0284e4b7758f.png?resizew=172)
(1)尺规作图:请作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173bc7a36757d77f01213411edd25241.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(2)在(1)所作的图中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/d2b509b41ae41fb5cc0d0d89932bb6a4.png)
更新时间:2022-12-19 09:13:58
|
相似题推荐
解答题-作图题
|
适中
(0.65)
【推荐1】阅读材料:
我们曾经解决过如下问题:“如图,点
,
分别在直线
同侧,如何在直线
上找到一个点
,使得
最小?”
①画草图(或目标图)分析思路:在直线
上任取一点
,连接
,
,根据题目需要,作点
关于直线
的对称点
,将
转化为
,“化曲为直”寻找
的最小值;
②设计画图步骤;
③回答结论并验证.
借鉴阅读材料中解决问题的三个步骤完成以下尺规作图:
已知三条线段
,
,
,求作
,使其
边上的高
,中线
,
.
画出一个即可
,并叙述简要的作图思路
即实现目标图的大致作图步骤
;
(2)完成尺规作图
不要求写作法,作出一个满足条件的三角形即可
.
我们曾经解决过如下问题:“如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c2bb1548ddc0e5536a35b1bd78c4e7cd.png)
①画草图(或目标图)分析思路:在直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5d57d7dd861286e5ee6ec8dff0e19c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38b07672b183b3157cbeea5e22ecac20.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5746c595419f97bcccc44df51140a25f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1da1eb60ecac9b22ed0d2c856dfbb4d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5aad500e81bd2aaefd53d827faf751dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f96b6c5c5e1969aff9177f733b85fa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f96b6c5c5e1969aff9177f733b85fa3.png)
②设计画图步骤;
③回答结论并验证.
借鉴阅读材料中解决问题的三个步骤完成以下尺规作图:
已知三条线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3eabd5f3a86afe49dcd70571e2b96cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071a7e733d466949ac935b4b8ee8d183.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/867155f973debabb6d833a4736844568.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3be96420ac78c8621fcb47a45514fa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c884a45b56bc34d79273b067c1520b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
(2)完成尺规作图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
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解答题-作图题
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名校
【推荐2】作已知
ABC的全等三角形.(尺规作图,不写作法保留作图痕迹)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2020/10/19/2574590393860096/2577035732549632/STEM/439c0234940848f2a3ddc99e681ba605.png?resizew=130)
您最近一年使用:0次
解答题-作图题
|
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名校
【推荐1】如图是由小正方形组成的
网格,每个小正方形的顶点叫做格点.(画图过程用虚线,画图结果用实线).
上找三点
(逆时针方向),使得四边形
为菱形;
(2)设每个小正方形的边长为1,直接写出扇形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e788125f02d28749c086590197487f2d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afd40d480b4b0a70f4e0dc10f601beff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
(2)设每个小正方形的边长为1,直接写出扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
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解答题-问答题
|
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【推荐2】如图所示,△OAB是边长为
的等边三角形,其中O是坐标原点,顶点A在x轴的正方向上,将△OAB折叠,使点B落在边OA上,记为B’,折痕为EF.
(2)当B’E//y轴时,求点B’和点E的坐标.
(3)当B’在OA上运动但不与O、A重合时,能否使△EB’F成为直角三角形?若能,请求出点B’的坐标;若不能,请说明理由.
\
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ce55e24888ed0b23d54e44ee055cf74.png)
(1)设OB’的长为x,△OB’E的周长为c,求c关于x的函数关系式.
(2)当B’E//y轴时,求点B’和点E的坐标.
(3)当B’在OA上运动但不与O、A重合时,能否使△EB’F成为直角三角形?若能,请求出点B’的坐标;若不能,请说明理由.
![](https://img.xkw.com/dksih/QBM/2012/2/13/1573340423012352/null/STEM/926368158d2845329707d4570757b832.png?resizew=234)
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解答题-证明题
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【推荐1】平行四边形ABCD的对角线AC和BD交于O点,分别过顶点B,C作两对角线的平行线交于点E,得平行四边形OBEC.
(1)如果四边形ABCD为矩形(如图),四边形OBEC为何种四边形?请证明你的结论;
(2)当四边形ABCD是 形时,四边形OBEC是正方形.
(1)如果四边形ABCD为矩形(如图),四边形OBEC为何种四边形?请证明你的结论;
(2)当四边形ABCD是 形时,四边形OBEC是正方形.
![](https://img.xkw.com/dksih/QBM/2017/12/3/1830627598221312/1831654232096768/STEM/40774bb81d104ae9a0fafa11e2095761.png?resizew=168)
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解答题-证明题
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【推荐2】在△ABC中,AB=BC,将△ABC绕点B顺时针旋转至△A1BC1的位置,如图,A1B交AC于点E,A1C1分别交AC,BC于D,F两点.
(1)观察并猜想线段EA1与FC有怎样的数量关系?并证明你的结论;
(2)若将△ABC绕点B顺时针旋转至△A1BC1的位置,如图2,当DC1=BC1时,求证AC∥BC1
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567931904/STEM/afed80be-b683-4b02-9238-6316c637776b.png)
(1)观察并猜想线段EA1与FC有怎样的数量关系?并证明你的结论;
(2)若将△ABC绕点B顺时针旋转至△A1BC1的位置,如图2,当DC1=BC1时,求证AC∥BC1
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567931904/STEM/afed80be-b683-4b02-9238-6316c637776b.png)
![](https://img.xkw.com/dksih/QBM/2021/11/17/2853282304155648/2855534567931904/STEM/0276b34b-6b7e-4f99-b565-0e1e03d7aff5.png)
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解答题-证明题
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【推荐1】如图,点O是等边
内一点,
,
等于
,将
绕点C按顺时针方向旋转
得
,连接
.
![](https://img.xkw.com/dksih/QBM/2024/1/1/3401677254942720/3401833899335680/STEM/fd247d5a6a0d4b45a4e58ce2182e1c2a.png?resizew=142)
(1)求证:
是等边三角形;
(2)求
的度数;
(3)若
,请探究:当
为多少度时,
是等腰三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a1bcaff75f42da99fd3698cce042aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a7ffcd1925a2b1259221c6a476152f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://img.xkw.com/dksih/QBM/2024/1/1/3401677254942720/3401833899335680/STEM/fd247d5a6a0d4b45a4e58ce2182e1c2a.png?resizew=142)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fba1315d450c8353c6611785f71546b5.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037ded7b2c5361b4aae67dd0a81da29e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/372629a8666de1e9bac3e7daadcac7b6.png)
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解答题-计算题
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【推荐2】如图,矩形
中,
,
,边
在直线l上,将矩形
沿直线l作无滑动翻滚,当点A第一次翻滚到点A1位置时,则点A经过的路线长为___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/8/35d9534a-87a8-4dbf-949d-b0cc8d448605.png?resizew=334)
您最近一年使用:0次