如图,在
中,
,
,
为
边上的中线.点
从点
出发,以每秒
个单位长度的速度沿
向终点
运动.同时点
从点
出发,以每秒4个单位长度的速度沿
向终点A运动,连接
,将线段
绕点
逆时针旋转
得到线段
,以
、
为边作正方形
.设点
运动的时间为
秒
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/56ebae75-f5e4-4460-90fd-91abe81f8b7b.png?resizew=119)
(1)
的长为______;
(2)求点
到
的距离;(用含
的代数式表示)
(3)当点
落在
上时,直接写出
的长;
(4)连接
,当
与
平行或垂直时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6791c5e055bbfd9a4200eb3a34d3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de8cc58ef27567f0ab06eb1012aec330.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b91d650c2fc1a741fabdb333b09aeb6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a363df9127fb019f87ec53470c50dcc3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/16/56ebae75-f5e4-4460-90fd-91abe81f8b7b.png?resizew=119)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求点
![](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/36a1b09c653185842513e24ebba60bb3.png)
(3)当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(4)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c83f1f880e5ffbff036953acaca90c41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
更新时间:2024-01-16 22:24:45
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】在长方形
中,
,
,点
在线段
上运动,将线段
绕点
顺时针旋转
至
,连接
,
.
点落在
边上时,求
的长度;
(2)如图2,在运动过程中,当线段
最短时,求
的度数;
(3)连接
,当
为等腰三角形时,直接写出
的长度.
![](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/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5adb5eb60ae4435a12d93854066298.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
(2)如图2,在运动过程中,当线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a67e3685787de6e03cac347967a487da.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2689f0ce5ab3467d8214794d8acb2bd6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
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【推荐2】问题情境:在学习了正方形后,彩虹中学的2101班的同学对正方形进行了探究,特邀请你一起加入此次的探究:如图,正方形
的边长为6,点E是对角线
上的动点,连接
.
(1)【探究】如图1:若过点E作
交
于点F,经过探究,请你猜想
与
的数量关系,并加以证明.
(2)【应用】如图2:在(1)的探究情况下,过点E作
于点G,若
,求
的长.
(3)【拓展探究】如图3,若点F是
上的一个动点,且始终满足
,设
,请你直接写出
的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/6/d7b35078-4e37-482e-a3c8-812b31f2d3b1.png?resizew=442)
(1)【探究】如图1:若过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39b179527d768ba1e2103a26070fa034.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)【应用】如图2:在(1)的探究情况下,过点E作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11a2ecec3e259421d01eafa941834c3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/689b95a2eeb841dd3a0a3a6dfa3be8fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
(3)【拓展探究】如图3,若点F是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d1125b47dec1c5e93143ee59ad862a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33c8543fba3c2edd38837914a8ef3ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b0a89e3c30f6e4d4c5db4378b05d987.png)
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【推荐1】如图1,我们把对角线互相垂直的四边形叫做垂美四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/f53e6274-e835-4d5e-b735-c7e77b145303.png?resizew=334)
(1)写出2个所学的特殊四边形是垂美四边形: , ;
(2)性质探究:已知:如图1,四边形
是垂美四边形,对角线
、
相交于点
.猜想:
与
有什么关系?并证明你的猜想;
(3)问题解决:如图2,分别以
的直角边
和斜边
为边向外作等腰![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d59a04c7dd3f6492fbab5a027872109.png)
和等腰![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a2e4266fcd618efef4cae772ee2dcf.png)
,连接
,
,
,已知
,
.求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/10/f53e6274-e835-4d5e-b735-c7e77b145303.png?resizew=334)
(1)写出2个所学的特殊四边形是垂美四边形: , ;
(2)性质探究:已知:如图1,四边形
![](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/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87ccaffaef6f38483039cfd0ea66a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f20e665f13e64e4c924d022708cdc56.png)
(3)问题解决:如图2,分别以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36d87153e50e195347e7b7ef685a462.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d59a04c7dd3f6492fbab5a027872109.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbe4d722ab5670d74215f1da3cd3cdff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73a2e4266fcd618efef4cae772ee2dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074f5b133f3533b9429633f219909b80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4083c581c6027c4b2ae7e3b3749f485.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91f3956f008cc29ca4bae44a087d5427.png)
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【推荐2】阅读下面的例题及点拨,并解决问题:
如图①,在等边
中,M是BC边上一点(不含端点B,C),N是
的外角∠ACH的平分线上一点,且AM=MN.求证:∠AMN=60°.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/836a280e-be64-434b-b876-2892318840ee.png?resizew=549)
(1)点拨:如图②,作∠CBE=60°,BE与NC的延长线相交于点E,得等边△BEC,连接EM.易证:
(SAS),请完成剩余证明过程:
(2)拓展:如图③,在正方形A1B1C1D1中,
是B1C1边上一点(不含端点B1,C1),N1是正方形A1B1C1D1的外角∠D1C1H1的平分线上一点,且A1M1=M1N1.求证:∠A1M1N1=90°.
如图①,在等边
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f80f699558ff62a31152df321b064f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f80f699558ff62a31152df321b064f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/21/836a280e-be64-434b-b876-2892318840ee.png?resizew=549)
(1)点拨:如图②,作∠CBE=60°,BE与NC的延长线相交于点E,得等边△BEC,连接EM.易证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5b24a101e12d28abd6c26ac47610b8.png)
(2)拓展:如图③,在正方形A1B1C1D1中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc8d3bc2d874e4554897da59bb81e4b.png)
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【推荐3】如图1,在正方形ABCD中,AD=9,点P是对角线BD上任意一点(不与B、D重合),点O是BD的中点,连接PC,过点P作PE⊥PC交直线AB于点E.
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525310552481792/2526713313280000/STEM/70159eb6aedf41b28876b0eb38d56f87.png?resizew=330)
初步感知:当点P与点O重合时,比较:PC PE(选填“>”、“<”或“=”).
再次感知:如图1,当点P在线段OD上时,如何判断PC和PE数量关系呢?
甲同学通过过点P分别向AB和BC作垂线,构造全等三角形,证明出PC=PE;
乙同学通过连接PA,证明出PA=PC,∠PAE=∠PEA,从而证明出PC=PE.
理想感悟:如图2,当点P落在线段OB上时,判断PC和PE的数量关系,并说明理由.
拓展应用:连接AP,并延长AP交直线CD于点F.
(1)当
=时,如图3,直接写出
的面积为 ;
(2)直接写出
面积S的取值范围.
![](https://img.xkw.com/dksih/QBM/2020/8/11/2525310552481792/2526713313280000/STEM/70159eb6aedf41b28876b0eb38d56f87.png?resizew=330)
初步感知:当点P与点O重合时,比较:PC PE(选填“>”、“<”或“=”).
再次感知:如图1,当点P在线段OD上时,如何判断PC和PE数量关系呢?
甲同学通过过点P分别向AB和BC作垂线,构造全等三角形,证明出PC=PE;
乙同学通过连接PA,证明出PA=PC,∠PAE=∠PEA,从而证明出PC=PE.
理想感悟:如图2,当点P落在线段OB上时,判断PC和PE的数量关系,并说明理由.
拓展应用:连接AP,并延长AP交直线CD于点F.
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20c3a57ef5d60f663a053ed7a2ec3055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
(2)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/729684f958ad60b8e905fe1e1da53c03.png)
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真题
【推荐1】如图,⊙M过坐标原点O,分别交两坐标轴于A(1,O),B(0,2)两点,直线CD交x轴于点C(6,0),交y轴于点D(0,3),过点O作直线OF,分别交⊙M于点E,交直线CD于点F.
(1)求证:∠CDO=∠BAO;
(2)求证:OE•OF=OA•OC;
(3)若OE=
,试求点F的坐标.
(1)求证:∠CDO=∠BAO;
(2)求证:OE•OF=OA•OC;
(3)若OE=
![](https://img.xkw.com/dksih/QBM/2014/7/30/1573741840302080/1573741846347776/STEM/815b584970204686819c012a61314081.png)
|
|
![](https://img.xkw.com/dksih/QBM/2014/7/30/1573741840302080/1573741846347776/STEM/713e7f139b544864ba9db41545e2a568.png)
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【推荐2】如图,在正方形
中,
是边
上一点,
于点
,连接
,
交
于点
.
(1)求证:
;
(2)若
为
中点,
①求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d95ba804719af7f1654f8512d0f2e0.png)
②连接
,若
,求正方形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0fb03af3eb6b686788356cee344394.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/901eb612-cffd-4527-b290-787980239600.png?resizew=140)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a894809b3aaf8fff43873f9d1275a7f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77d95ba804719af7f1654f8512d0f2e0.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da8046ae7d118efabe9e2fbadcfe92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,AB是⊙O的直径,点P在⊙O上,且PA=PB,点M是⊙O外一点,MB与⊙O相切于点B,连接OM,过点A作
交⊙O于点C,连接BC交OM于点D.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/4bbf948e-cf12-40cf-8b7c-bed3e80bf780.png?resizew=151)
(1)求证:MC是⊙O的切线;
(2)若
,
,连接PC,求PC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/684b88ccfe1711cb1e0f687e0b6d221e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/4/4bbf948e-cf12-40cf-8b7c-bed3e80bf780.png?resizew=151)
(1)求证:MC是⊙O的切线;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d9e330e008f59fee62c69d3b65b3216.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff93695beac68cb1a38cdc4e131bd033.png)
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名校
【推荐2】如图,△ABC内接于⊙O,弦CD平分∠ACB,点E为弧AD上一点,连接CE、DE,CD与AB交于点N.
(1)如图1,求证:∠AND=∠CED;
(2)如图2,AB为⊙O直径,连接BE、BD,BE与CD交于点F,若2∠BDC=90°﹣∠DBE,求证:CD=CE;
(3)如图3,在(2)的条件下,连接OF,若BE=BD+4,BC=
,求线段OF的长.
(1)如图1,求证:∠AND=∠CED;
(2)如图2,AB为⊙O直径,连接BE、BD,BE与CD交于点F,若2∠BDC=90°﹣∠DBE,求证:CD=CE;
(3)如图3,在(2)的条件下,连接OF,若BE=BD+4,BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60cbb271baca5cd015f30e07d9eebfd8.png)
![](https://img.xkw.com/dksih/QBM/2018/9/9/2028590241333248/2031629783498752/STEM/545e4ae859e34e81a33e27b8b716df84.png?resizew=467)
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【推荐3】综合与实践
问题情境:数学课上,同学们以特殊四边形为基本图形,添加一些几何元素后探究图形中存在的结论.已知在
中,
,
的平分线交
边于点E,交
边的延长线于点F,以
为邻边作
.
特例探究:(1)如图1,“创思”小组的同学研究了四边形
为矩形时的情形,发现四边形
是正方形,请你证明这一结论;
(2)“敏学”小组的同学在图1基础上连接
,得到图2,发现图2中线段
与
之间存在特定的数量关系,请你帮他们写出结论并说明理由;
拓展延伸:(3)“善问”小组的同学计划对
展开类似研究.如图3,在
中,
.
请从下面A,B两题中任选一题作答.我选择________题.
A:当
,
时,请补全图形,并直接写出A,G两点之间的距离.
B:当
时,请补全图形,并直接写出以A,C,G为顶点的三角形面积的最小值.
问题情境:数学课上,同学们以特殊四边形为基本图形,添加一些几何元素后探究图形中存在的结论.已知在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c818110255bdad691f61be6461a6fd73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/196be9625865a5bbed79fa88a368ff1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/29/8dffc8ef-f25e-413b-93d3-02ce27311dbe.png?resizew=420)
特例探究:(1)如图1,“创思”小组的同学研究了四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82901484b0b4b192cdd45a88c6163aa3.png)
(2)“敏学”小组的同学在图1基础上连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2af3407afeb06f5a9c49f1254f654b77.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
拓展延伸:(3)“善问”小组的同学计划对
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
请从下面A,B两题中任选一题作答.我选择________题.
A:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
B:当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07160f14b3b453bebb64cb2bf96dc85a.png)
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