数学探究课上老师出这样一道题:“如图,等边
中有一点
,且
,
,
,试求
的度数.”小明和小军探讨时发现了一种求
度数的方法,下面是这种方法的一部分思路,请按照下列思路要求画图或判断.
(1)在图中画出
绕点
顺时针旋转
后的
;
(2)试判断
的形状,并说明理由;
(3)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/491c3a4f72b84ebadd28b90711435adc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b336e518ac4ff04c6c26e4b8a15844.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a43c2d5aae759fc4db16115c8188ceec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/5/4cd543ae-8c85-49ea-86e9-e7097148adb0.png?resizew=142)
(1)在图中画出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9524e3810e06dc781285f1289e75d653.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f55b2d889807818e32a48904d80cae32.png)
(2)试判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e6dab952c0ffa5d945263a02e79bb18.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb686e4f5e3938575bc547e849d5513f.png)
更新时间:2023-08-03 22:45:44
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相似题推荐
解答题-问答题
|
适中
(0.65)
【推荐1】在拓展课上,小林用圆规以点
为圆心,
长为半径画弧
,使得
,第二次同样按逆时针画圆弧到
点,设
,显然
,连接
.
(1)如图
,连接
.
①若
,直接写出
的度数;
②在第二次画圆弧过程中,请探究
的大小是否改变?若不改变,求出
的度数;若改变,请说明理由;
(2)如图
,若以
为斜边作
,使得
,连接
,
,若
,试判断
的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd2d75901a95b2e964e949d13b5a8146.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a83ed45064ec6e16c0024adfc8e2804.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
(1)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/1182b4b3-f0bb-44b1-b7f5-7a269ab77e0a.png?resizew=171)
①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f158832d4c0f7cb508a89ff13763bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
②在第二次画圆弧过程中,请探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a72dfbf0138a611174c36ce077e0c47.png)
(2)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1a3b94566843e92ce775ff6bdf386fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7178f1022e05638a818208b3141f0795.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a936aa06a979896623d0e1fdadfd84b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/20/ed81b780-9b9e-4419-b3bf-4fdd93a52565.png?resizew=202)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,在等边
中,
为
上一点,
为
延长线上一点,连接
交
于点
,且
,过点
作
交
于点
.
(1)求证:
是等边三角形;
(2)求证:
.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a26b33f5b71039c35ac5e93795e254f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef3a7d7da25b68cedf81462ea2b0ed16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/19/85be0672-7bf4-49cd-ac26-e6c32151ce2c.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26e59b7c0d4a0b312e674b7bb061240b.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46ce838f38419e8781d63b3417cac5e4.png)
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解答题-证明题
|
适中
(0.65)
【推荐1】在四边形
中,
,
,
,
,
,
(1)求
的长;
(2)求证:
是直角三角形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60d9142db4dd2ef151bf3d4a63afb61e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68b40d0d2f3cdd8981bb792ad87efb42.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab926d89b65f26c12e3da73ef1e5cf68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/833cfda415649b832cc136caed392753.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9c3ec174b1ce835cc8737ff6ce57e52.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/9/0616b0f3-8a9f-4e03-8786-d23d3fa6aecc.png?resizew=217)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
【推荐2】如图,在四边形
中,对角线
、
相交于点O,
,
.
是平行四边形;
(2)若
,
,
,四边形
是菱形吗?证明你的判断.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b05a29fbfa273ec36bc13f4d9b1411d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8d2530e7023b2345c651e8f53629ff1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/addb8e20db1fbb40f17dea52f951b907.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7edbbab119e1b312eb4b09d383a4410a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f25936291abb6432ed5a710ebf0ea195.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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适中
(0.65)
【推荐1】按下列要求画图:
![](https://img.xkw.com/dksih/QBM/2016/2/18/1573972225515520/1573972231684096/STEM/4a6fcef52d484c5aa746d4d506aa486f.png)
(1)将①中的图平移至②中的方格中;
(2)将平移后的图形沿虚线翻折到③的方格中;
(3)将翻折后的图形绕0点旋转180度到图④的方格中.
![](https://img.xkw.com/dksih/QBM/2016/2/18/1573972225515520/1573972231684096/STEM/4a6fcef52d484c5aa746d4d506aa486f.png)
(1)将①中的图平移至②中的方格中;
(2)将平移后的图形沿虚线翻折到③的方格中;
(3)将翻折后的图形绕0点旋转180度到图④的方格中.
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解答题-作图题
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适中
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【推荐2】如图,
中,∠C=90°
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/7aeac9e2-bd59-4acb-a06e-ff93a33ac811.png?resizew=196)
(1)将
绕点B逆时针旋转90度,画出得到的
;
(2)已知BC=3,AC=4,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/18/7aeac9e2-bd59-4acb-a06e-ff93a33ac811.png?resizew=196)
(1)将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/854f480c60b88b546cb15d3b5622e212.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/265d1dd6b84f643af26c9e9ddd341bd1.png)
(2)已知BC=3,AC=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6024fd4532f5f981deac4582c799a6ef.png)
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解答题-问答题
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适中
(0.65)
【推荐1】如图,在单位为1的网格中,有△ABC,且的三个顶点都在格点上:
(1)以点C为原点建立直角坐标系,并确定A点的坐标;
(2)将△ABC向下平移5个单位,得到△A1B1C1(不写作法);
(3)以点C为旋转中心,将△ABC顺时针旋转90°得到△A2B2C2(不写作法);
(4)求弧BB2的长.
(1)以点C为原点建立直角坐标系,并确定A点的坐标;
(2)将△ABC向下平移5个单位,得到△A1B1C1(不写作法);
(3)以点C为旋转中心,将△ABC顺时针旋转90°得到△A2B2C2(不写作法);
(4)求弧BB2的长.
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115059089973248/2167423445295104/STEM/f7c433a1eebc47efaedb1e2794bbf8ff.png?resizew=221)
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解答题-问答题
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适中
(0.65)
【推荐2】(1)阅读理解:
如图①,在
中,若
,求
边上的中线
的取值范围.可以用如下方法:将
绕着点D逆时针旋转
得到
,在
中,利用三角形三边的关系即可判断中线
的取值范围是_______;
(2)问题解决:
如图②,在
中,D是
边上的中点,
于点D,
交
于点E,DF交
于点F,连接
,求证:
;
(3)问题拓展:
如图③,在四边形
中,
,
,
,以C为顶点作一个
的角,角的两边分别交
于E、F两点,连接EF,探索线段
之间的数量关系,并说明理由.
如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/74cbbe13ece058e5e014a8eaf435eb6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e7a123c9cc0e058db28841fb0edcf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b96715995549e5e48494101570bb3bb8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)问题解决:
如图②,在
![](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/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da9b7f934bab7011daa609c8d020e977.png)
(3)问题拓展:
如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/173904239da66b7bef7cb1d997cc40ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b0382c28547d3834ca71f3f0677695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dce8ebe684ab4fd905deddd160462847.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fdc40f1bd736b060d195e899c13bd39.png)
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