名校
1 . 如图1,把一个含
角的直角三角板
和一个正方形
摆放在一起,使三角板的直角顶点和正方形的顶点C始终重合,连接
,取
的中点M,
的中点N,连接
、
.
和正方形
如图1摆放,点E、F分别在正方形的边
、
上,请直接写出
与
之间的数量关系.
(2)若直角三角板
和正方形
如图2摆放,点E、F分别在
、
的延长线.其他条件不变,则(1)中的结论还成立吗?若成立,请加以证明;若不成立,请说明理由.
(3)①在摆放过程中,若
,则
的面积
______(用含a的式子表示)
②若
,
,连接
,在摆放的过程中,
的面积存在最大值
和最小值
,请直接写出
和
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b342d5cb6dd1c84a82f6aca68ed829c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f636f76d550dfb593a25eb680cff556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f636f76d550dfb593a25eb680cff556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be2e2c0d4ac2bd79f6cea7a9b1a50662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
(2)若直角三角板
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f636f76d550dfb593a25eb680cff556.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
(3)①在摆放过程中,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a588fa0845b97467c3e97f7346977279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/447a9718a502491b47072ce013c26a2f.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/999c42a021bdc576f097246b9e64d986.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
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2 . 琅琊中学九年级一班同学利用工具,对几种四边形进行探究.
中,该工具与正方形四条边的交点分别为E、F、G、H.
(1)若点O在边长为1的正方形
的中心,直接写出
的最大值和最小值.
(2)试猜想
的值,并证明你的猜想.
【知识迁移】如图2,同学们又将该工具放入矩形
中,该工具与矩形四条边的交点分别为E、F、G、H.若
,
,则
.(直接写出答案)
【拓展运用】如图3,同学们将工具放入四边形
中,使其经过C、B两点,并与
边交于点
,与
边交于点
.已知
,
,
.求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)若点O在边长为1的正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/219c318e9e61fa301cad75655d433a2b.png)
(2)试猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/885a273360456694a3d40a913f3df2fc.png)
【知识迁移】如图2,同学们又将该工具放入矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa375c3888b332f24e7d0f9b9600c694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890aea25780f7ba34adb23e799808462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d852b8a7e7b287c0bae2ce10d3e6dc1.png)
【拓展运用】如图3,同学们将工具放入四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2b377f22aafd3742ad860f77abaacef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ea624cb140001a7e9d7567903a29521.png)
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3 . 如图①.已知
是等腰直角三角形,
,点D是
的中点,作正方形
,使点
,
分别在
和
上,连接
,
.
和
的数量关系,并证明你得到的结论;
(2)将正方形
绕点D逆时针方向旋转一定角度后(旋转角度大于
,小于或等于
),如图②,通过观察或测量等方法判断(1)中的结论是否仍然成立?如果成立,请予以证明;如果不成立,请说明理由;
(3)若
,在(2)的旋转过程中,
①当
为最大值时,则
___________.
②当
为最小值时,则
___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2257da1e2425f2ea9ac7440f52659ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/235d495d88b8e51f89e2e4da27328025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b2ccc34a8b3cf908af78bdbe804afac.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4684129b59854b3cd69312c828aeb7da.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4e5f441402ee632377b6bedeb060f3d9.png)
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名校
4 . (1)如图1,在正方形
中,E为
边上一动点(点E,B不重合),
是等腰直角三角形,
,连接
,求出
的大小.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/71fffd41-8fb9-4041-be37-caa8408e43ab.png?resizew=193)
(2)如图2,正方形
的边长为2,
,在
下方以
为斜边作等腰直角
,求
的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/1eed21e1-1fed-4eab-b6d8-8a6556972100.png?resizew=178)
(3)如图3,在正方形
中,E为
边上一动点(点E,B不重合),
是等腰直角三角形,
,连接
,知道正方形的边长时,可以求出
周长的最小值.当
时,请你求出
周长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b78356dbceb326e1b1561e0a15d8ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63a253c7fdf589ee3dece13d5b5b5732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebf7cc67acfa50ef6b21d9aa379e604a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/71fffd41-8fb9-4041-be37-caa8408e43ab.png?resizew=193)
(2)如图2,正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5564681937f41e1489d69b20a71f9222.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12225a1a1eda07908309f8100cc34726.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/1eed21e1-1fed-4eab-b6d8-8a6556972100.png?resizew=178)
(3)如图3,在正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/099dd87a526391f830ac2a11e7d7ad56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b78356dbceb326e1b1561e0a15d8ebb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da7bcea5a45eeae211f5851f12a7517.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/53940653-696f-4708-aeea-1540538ba1f4.png?resizew=200)
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5 . 已知点M是矩形ABCD的边AB上一个动点,过点M作MG⊥CD于点G,交对角线AC于点E,连接BE,过点E作EF⊥BE,交射线DC于点F.
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874531521126400/2942467601137664/STEM/1efd0f1ecb2a478e8a6f3fc03301c2f2.png?resizew=315)
(1)如图1,若AB=AD,则FG与DG的数量关系是 ;
(2)如图2,若AB=4,AD=3,
①当点M在边AB上移动时,FG与DG的数量关系是否保持不变?若不变,请仅就图2求出它们之间的数量关系;若变化,请说明理由.
②当
时,请直接写出AM的最大值和最小值.
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874531521126400/2942467601137664/STEM/1efd0f1ecb2a478e8a6f3fc03301c2f2.png?resizew=315)
(1)如图1,若AB=AD,则FG与DG的数量关系是 ;
(2)如图2,若AB=4,AD=3,
①当点M在边AB上移动时,FG与DG的数量关系是否保持不变?若不变,请仅就图2求出它们之间的数量关系;若变化,请说明理由.
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c874c02729e37edce879d971c2eddac3.png)
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6 . 如图1,将等腰直角三角形AEF绕着正方形ABCD的顶点A顺时针旋转,已知正方形的边长为
,
.
(2)如图3,连接CF,在旋转过程中,求CF的最大值和最小值;
(3)如图4,延长BF交DE于点G,连接CG,若
,求GC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b348d598a0fc163951e1145909910d43.png)
(2)如图3,连接CF,在旋转过程中,求CF的最大值和最小值;
(3)如图4,延长BF交DE于点G,连接CG,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e82639ea868a395fe4c64f9e0ad4d966.png)
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2022-05-18更新
|
332次组卷
|
4卷引用:2022年贵州省桐梓县九年级下学期第一次模拟考试数学试题
名校
解题方法
7 . 问题提出:
(1)同一平面内的两条线段
和
,已知
,
,则线段
最大值是______;最小值是______.
问题探究:
(2)如图,四边形
中,
,
,
,且
,问
是否存在最大值?若存在,求出最大值;若不存在,请说明理由.
问题解决:(自行作图并解决)
(3)在
中,
,
,以
为一边作正方形
,连接
,问
是否存在最大值或者最小值?若存在,求出相应最值;若不存在,请说明理由.
(1)同一平面内的两条线段
![](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/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
问题探究:
(2)如图,四边形
![](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/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/25/01e59879-cb0a-40ca-b614-7d7bb787f84d.png?resizew=99)
问题解决:(自行作图并解决)
(3)在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6166b9a5437671bcba31e17c375eb39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39d0ce04b5304e191f2d9b8907796ee3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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名校
8 . 如图①,C为线段BE上的一点,分别以BC和CE为边在BE的同侧作正方形ABCD和正方形CEFG,M、N分别是线段AF和GD的中点,连接MN
(1)线段MN和GD的数量关系是_____ ,位置关系是_____ ;
(2)将图①中的正方形CEFG绕点C逆时针旋转90°,其他条件不变,如图②,(1)的结论是否成立?说明理由;
(3)已知BC=7,CE=3,将图①中的正方形CEFG绕点C旋转一周,其他条件不变,直接写出MN的最大值和最小值.
(1)线段MN和GD的数量关系是
(2)将图①中的正方形CEFG绕点C逆时针旋转90°,其他条件不变,如图②,(1)的结论是否成立?说明理由;
(3)已知BC=7,CE=3,将图①中的正方形CEFG绕点C旋转一周,其他条件不变,直接写出MN的最大值和最小值.
![](https://img.xkw.com/dksih/QBM/2017/8/22/1757744269893632/1758167709786112/STEM/06bbb0d87420469ca1c399eaaf95f816.png?resizew=320)
您最近一年使用:0次
2017-08-23更新
|
1135次组卷
|
7卷引用:2016届辽宁省抚顺市房申中学九年级下学期第三次质检数学试卷
9 . 如图1,在正方形
中,点E在
上(不与点B,C重合),点F在边
上,
,连接
交于点M.
;
(2)如图2,连接
与
交于点G,连接
交
于点H.
①求证:
;
②当
时,求
的值;
(3)如图3,若E是
的中点,以点B为圆心,
为半径作
,P是
上的一个动点,连接
交
于点N,则
的最大值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e9b905d59d51d36fe6392abb976af00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4e22ba3e6e1c1d6b12d9b8baa8d1f02.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b35decd3e0d197ee679f2130bafba539.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dde23df882287c60347627cd59d73e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f34ad0e0c77f5b6168890a9b89614f.png)
(3)如图3,若E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6f6558fef858bf27e9811c2d9426fe7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd17a66a2af938c89e46f22e4d893b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/057443e38a2d10d1b692e5580300196a.png)
您最近一年使用:0次
2024-06-02更新
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204次组卷
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2卷引用:2024年浙江省台州市路桥区中考数学二模试题
名校
10 . 小新同学在数学探究课上,用几何画板进行了如下操作:首先画一个正方形
,一条线段![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
,再以点A为圆心,
的长为半径,画
分别交
于点E,交
于点G,过点E,G分别作
、
的垂线交于点F,易得四边形
也是正方形,连接
.
①
与
的大小关系:______;
②
与
的大小和位置关系:______.
(2)【尝试证明】如图2,将正方形
绕圆心A转动,在旋转过程中,上述①②中的关系还存在吗?请说明理由.
(3)【思维拓展】如图3,若
,则:
①在旋转过程中,点B,A,G三点共线时,
的值为______;
②在旋转过程中,
的最大值是______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dae6473d0feaf71d36c5a2d24313db6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abd13974aebe38eb2a1d744a01ea5aa5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c20d0b44025a639ce3a92d639dae587.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
(2)【尝试证明】如图2,将正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8d0e8404f347a0eb4c76f4d25d9bdac.png)
(3)【思维拓展】如图3,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/881afead8f7fe2064149138221b5ed98.png)
①在旋转过程中,点B,A,G三点共线时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
②在旋转过程中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
您最近一年使用:0次
2024-05-01更新
|
75次组卷
|
2卷引用:江西省吉安市2023-2024学年九年级下学期期中数学试题