综合实践
实践操作:已知正方形ABCD中,边长
.
将正方形ABCD做如下两次变换:先将正方形ABCD沿着射线DA向左平移,平移距离为m,得到正方形HEFG,如图①.再将正方形绕着点E逆时针旋转,旋转角为
,使得点H正好落在线段BD上,如图②.
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974505876520960/2975508707344384/STEM/859a1a5d-4348-4941-8756-ddafaba111a7.png?resizew=525)
问题探究:
(1)若通过两次操作,使得GH落在直线DB上,如图③;问题:旋转角为
______度;平移距离为
______.
(2)如图②,若通过两次操作,点H落在DB的中点上;问题:旋转角为
______度;平移距离为
______.
拓展探究:
(3)如图②,若通过两次操作后,
;则
______(用含有n的代数式表示)
(4)在图②中,HG、EH分别交BC、AB于点M、N,过M、N分别作HG、HE的垂线,两垂线交于点P,判断四边形MPNH的形状,并说明理由.
实践操作:已知正方形ABCD中,边长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
将正方形ABCD做如下两次变换:先将正方形ABCD沿着射线DA向左平移,平移距离为m,得到正方形HEFG,如图①.再将正方形绕着点E逆时针旋转,旋转角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/5/7/2974505876520960/2975508707344384/STEM/859a1a5d-4348-4941-8756-ddafaba111a7.png?resizew=525)
问题探究:
(1)若通过两次操作,使得GH落在直线DB上,如图③;问题:旋转角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
(2)如图②,若通过两次操作,点H落在DB的中点上;问题:旋转角为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6c57bbef89a37f1a3808c0ceeac0c22.png)
拓展探究:
(3)如图②,若通过两次操作后,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2778a09eb4745e1e992f0e821dcc525e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00b80751c98f9991b9cfc03923a98834.png)
(4)在图②中,HG、EH分别交BC、AB于点M、N,过M、N分别作HG、HE的垂线,两垂线交于点P,判断四边形MPNH的形状,并说明理由.
更新时间:2022-05-09 08:30:52
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解答题-问答题
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【推荐1】如图,在
中,点D,E,F分别是
的中点,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/be267ea5-7f63-4e96-a6ea-4a7e88967055.png?resizew=271)
(1)试猜想四边形
的形状,并说明理由.
(2)若
,试判断线段
与
的关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febd0130486aea7910897fd19b7f58cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/942e6dafcfcbf0682856b9f25178694d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/7/be267ea5-7f63-4e96-a6ea-4a7e88967055.png?resizew=271)
(1)试猜想四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52d92ae441a3776a921b4e1b51ec09e0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5cf9715725d7bab609ce4ed7108e3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】综合与探究
如图是一个正方形纸片
,如果将正方形纸片
绕点
逆时针旋转角度![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
,得到正方形
,
交
于点
,
的延长线交
于点
,连接
、
.
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767462182912/2484490701414400/STEM/855d2ed98b2744a9b77aff083420a6fa.png?resizew=136)
(1)求证:
平分
;
(2)直接写出线段
、
、
之间的数量关系;
(3)连接
,
,
,
,试探究在旋转过程中,四边形
能否成为矩形?请说明理由.
如图是一个正方形纸片
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/2020/6/10/2481767462182912/2484490701414400/STEM/855d2ed98b2744a9b77aff083420a6fa.png?resizew=136)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
(2)直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c4cd68cc82e90a5e2049a7ea3171b84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
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【推荐1】如图,在平面直角坐标系中,△AOB是边长为3的等边三角形,将△AOB绕着点B按顺时针方向旋转得到△DCB,使得点D落在x轴的正半轴上,连接OC,AD.
(1)求证:OC=AD;
(2)求OC的长.
(1)求证:OC=AD;
(2)求OC的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/15/a9534200-f68c-4aac-8389-16d6a6f7a96e.png?resizew=185)
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【推荐2】如图,
绕点A逆时针旋转
,得到
,点
落在
的延长线上,延长
交
的延长线于点D,交
于E,连接
,已知
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/ee311a42-aed6-4745-87a8-df69dc2a5fa6.png?resizew=159)
(1)试说明
为等边三角形.
(2)求
的长度
(3)求四边形
的面积
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6b86c22b670a8e9f3896f9e8883fbbb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4c92b5799d12ea37de46d7c942ce7a9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e737bc35da650eda3825d29799b5f86f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/6/ee311a42-aed6-4745-87a8-df69dc2a5fa6.png?resizew=159)
(1)试说明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(3)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd437f4917539fbc598e539ffe422c7.png)
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名校
【推荐1】如图,点
在
边
上,∠ACD=∠B,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/b6cebf9c-d986-438c-a00d-8ec12e4b2a44.png?resizew=153)
(1)求证:
.
(2)若AD=1,BD=3,求AC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/b6cebf9c-d986-438c-a00d-8ec12e4b2a44.png?resizew=153)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1731e7adb9e3fd4cc15f7f8a9fe3f320.png)
(2)若AD=1,BD=3,求AC的长.
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【推荐2】如图,在△ABC中,∠ABC、∠ACB的平分线相交于点O,过点O的直线DE∥BC,分别交AB、AC于点D、E.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975803288281088/2976484338458624/STEM/8a660ff0-7eb7-42f2-954d-c5337712d780.png?resizew=168)
(1)求证:DE=BD+CE;
(2)若AD=3,BD=CE=2,求BC的值.
![](https://img.xkw.com/dksih/QBM/2022/5/9/2975803288281088/2976484338458624/STEM/8a660ff0-7eb7-42f2-954d-c5337712d780.png?resizew=168)
(1)求证:DE=BD+CE;
(2)若AD=3,BD=CE=2,求BC的值.
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【推荐2】在△ABC中,∠C=90°.
(1)已知:c=8
,∠A=60°,求∠B及a,b的值;
(2)已知:a=3
,c=6
,求∠A,∠B及b的值.
(1)已知:c=8
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
(2)已知:a=3
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35361e76a7c85d1886728c8d0200b234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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