【问题情境】
(1)爱探究的小明在做数学题时遇到这样一个问题:如图
,
是
的直径,
是
上的一动点,若
,则
面积的最大值为 .请帮小明直接填空;
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/b23fe593-9b65-4c73-a7d6-c3bf7f0ed39a.png?resizew=394)
【模型归纳】
(2)小明在完成填空后,对上面问题中模型进行如下归纳:如图
,
是
的弦,
是
优弧上的一动点,过
点作
于
点,当且仅当
经过圆心
时,
最大.请帮助小明完成这个结论的证明;
【模型应用】
(3)如图
是四边形休闲区域设计示意图
,已知
,
,休闲区域内原有一条笔直小路
的长为
米,现为了市民在该区域内散步方便,准备再修一条长为
米的小路
,满足点
在边
上,点
在小路
上.按设计要求需要给图中阴影区域(即
与四边形
,小路宽度忽略不计)种植花卉,为了节约成本且满足设计需求,阴影部分的面积要尽可能的小.请问,是否存在符合设计要求的方案?若存在,请直接写出阴影部分面积的最小值;若不存在,请说明理由.
(1)爱探究的小明在做数学题时遇到这样一个问题:如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/10/b23fe593-9b65-4c73-a7d6-c3bf7f0ed39a.png?resizew=394)
【模型归纳】
(2)小明在完成填空后,对上面问题中模型进行如下归纳: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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e4b16c2c6c9bd089da78122e9d2511.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
【模型应用】
(3)如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a651eb577dbada1f29590e558d6f9fa2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1f959e5f8d89390f0f136f6acc9f6fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b53c7539ed297ea63b9ace6f5cc58ca8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.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/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.png)
2023·广东深圳·模拟预测 查看更多[2]
更新时间:2023-11-06 16:48:12
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】探究题:
(1)问题发现:如图1,
和
均为等边三角形,点
、
、
在同一直线上,连接
.填空:①
的度数为______(直接写出结论,不用证明).
②线段
、
之间的数量关系是______(直接写出结论,不用证明).
(2)拓展探究:如图2,
和
均为等腰直角三角形,
,点
、
、
在同一直线上,
为
中
边上的高,连接
.请判断
的度数及线段
、
、
之间的数量关系,并说明理由.
(3)解决问题:在(2)问的条件下,若
,
,试求
的面积(用
,
表示).
(1)问题发现:如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417d8c68aac736fa56f7fc6f6c8a07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
②线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)拓展探究:如图2,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/417d8c68aac736fa56f7fc6f6c8a07cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc75953bf5dcfa4af308c34bf9952d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bd3b58d32346a8d31bc90adc67d37b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a55a1a244f81097e05e715b69580faa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db54223bb3fc2fe2497213a4d1f94827.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)解决问题:在(2)问的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7caf44c1bb3ec61b80d82ef2f82d5194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7703648be91c2c3f46b6a25fc7d9f55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://img.xkw.com/dksih/QBM/2019/12/31/2367017182699520/2368368676560896/STEM/67b38b04-e1d5-4fe1-84aa-e556ef6d543f.png)
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名校
【推荐2】已知:如图,在等腰
中,
,
,将线段
绕点
顺时针旋转一定角度得到线段
.连接
交
于点
,过点
作线段
的垂线,垂足为点
,交
于点
.
(1)如图1,若![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc7f54acef4e40aad465ffe5f8b4b22.png)
①求
的度数;
②求证:
;
(2)如图2,若
,当
时,求
的值
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3570a95f68349fcd9417fcda62e78e7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/2/aed0a4c3-6513-42f4-9222-b1332f957970.png?resizew=403)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dc7f54acef4e40aad465ffe5f8b4b22.png)
①求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31123a003f9c8be58e0d78399e43c14a.png)
②求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81818f7742c8035eef5bd69f5f0b33b9.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1212f222bed8b39156d13de8a35f40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d21612258cc6990445f67eb110aa710.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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名校
【推荐3】(1)如图1,在
中,
,
.求证
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/678b93d1-4c8d-48e4-9d9d-362c63b96892.png?resizew=237)
①补全证明过程.
证明:如图2,取
中点D,连接
.
∴
.
在
中,
,
∴______;
∴
.
又
,
∴
.
∴
为______三角形.
∴
.
②请用文字概括①所证明的命题:____________.
(2)如图3,某市三个城镇中心D,E,F恰好分别位于一个等边三角形的三个顶点处,在三个城镇中心之间铺设通信光缆,以城镇D为出发点设计了三种连接方案:
方案1:
;
方案2:
(G为
的中点);
方案3:
(O为
三边的垂直平分线的交点).
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/10e7e840-9bcd-4c4f-a069-e1b14686a978.png?resizew=469)
①设
,通过计算,比较三种连接方案中铺设的光缆长度的长短;
②不计算,比较三种连接方案中铺设的光缆长度的长短,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebe44ff9f829f6c034682572ad00e366.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/678b93d1-4c8d-48e4-9d9d-362c63b96892.png?resizew=237)
①补全证明过程.
证明:如图2,取
![](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/70a837e686ef6ff93493b5dac99a48c2.png)
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
∴______;
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b7513e09cccf40c3a483064b97e48.png)
又
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5148450edc4b5666f86da2e6aceb5a55.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f08ba6e6d784b8aae6a15cb76c1f9dc.png)
②请用文字概括①所证明的命题:____________.
(2)如图3,某市三个城镇中心D,E,F恰好分别位于一个等边三角形的三个顶点处,在三个城镇中心之间铺设通信光缆,以城镇D为出发点设计了三种连接方案:
方案1:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3999ca5f7191d7416bb5c2d0e261688c.png)
方案2:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e2d0991f7c3532686036301b32095da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
方案3:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca77dbfb9fe1e09c404f18c647d6bd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/10e7e840-9bcd-4c4f-a069-e1b14686a978.png?resizew=469)
①设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea147ada4f0aefdd3808a6a1133792eb.png)
②不计算,比较三种连接方案中铺设的光缆长度的长短,并说明理由.
您最近一年使用:0次
解答题-问答题
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较难
(0.4)
【推荐1】
内接于
,
,
的长是
,
是
延长线上一点,连接
交
于点
,连接
交
于点
,连接
.
平分
,
①求证:
;
②若
,求
的长;
(2)如图(2)若
,求
面积的最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26fdd8e57562ba94e10e7f1d770826d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbff61fe9d4e93d7cc338489d1c99c40.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
①求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02da63892ac4df393e076078b1d10a59.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0761165f1176f3a5fe4f7b052832316d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(2)如图(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2ddd49625097d0a78df7170be4f882e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
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【推荐2】如图1,在四边形ABCD中,AB=AC,∠BAC=60°,∠B+∠C+∠ADB=4∠BAC,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c26dae76-90e8-401f-8929-f4849945f157.png?resizew=360)
(1)求∠ADC的度数;
(2)如图2,若AD=BD+CD,求证:AD平分∠BDC;
(3)如图3,在(2)的条件下,E、F分别在AC、AB上,交于点P,使得∠BPC=∠BDC,若BD=EF=7,AD=15,求△EFP的⾯积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/19/c26dae76-90e8-401f-8929-f4849945f157.png?resizew=360)
(1)求∠ADC的度数;
(2)如图2,若AD=BD+CD,求证:AD平分∠BDC;
(3)如图3,在(2)的条件下,E、F分别在AC、AB上,交于点P,使得∠BPC=∠BDC,若BD=EF=7,AD=15,求△EFP的⾯积.
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【推荐1】在平面内,旋转变换是指某一图形绕一个定点按顺时针或逆时针旋转一定的角度而得到新位置图形的一种变换.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/65a7fb81-9fff-43cb-9fd5-665ae0480c34.png?resizew=372)
【问题提出】
(1)如图①,在
中,点D为斜边AB上的一点,
,
,且四边形
是正方形,小明运用图形旋转的方法,将
绕点D逆时针旋转
,得到
(如图②所示),请你写出阴影部分的面积: ;
【问题探究】
(2)如图③,在四边形
中,
,
,
,
,过点A作
,垂足为E,求AE的长;
【问题解决】
(3)如图④,在四边形
中,
,
,将BC绕点B逆时针旋转
得到线段BE,连接AE.若
,
,求
的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/7/65a7fb81-9fff-43cb-9fd5-665ae0480c34.png?resizew=372)
【问题提出】
(1)如图①,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf3746205daae4787d8e31d74ba79e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35b2ac64b0463f3fcbb725ea7f59e45c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8af9fe604650641a65843cc05d3aca25.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e79d6deffb965386f2830b8383e29a88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc956c0e5f2096313b5bf2f586531ec7.png)
【问题探究】
(2)如图③,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adb32dae6823f572ffa028d684733c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9331fc29878c84b6a6a6a81d15b9eba4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6090bcc0214538f0b2e95e13e508f6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebad1043443cbb6ea67a53ee96d5026c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e7243e07ec64ced92d43fcf64a47295.png)
【问题解决】
(3)如图④,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c8da8430ae9b811b82527eb944cea18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed4e4b72607f34923d90890c25475449.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7a0387fc1258f31e44a10068c0ccfd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/adf3c5d87ae7bfa961905b089435a7b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b193272440e46c1339accbc851bd42a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa485cf3776f36aaf4abaadaf30fb85.png)
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【推荐2】在四边形
中,点
、
分别在边
、
上,且
,连接
、
交于点
,连接
、
交于点
,得四边形
(如图1所示).则称四边形
为四边形
的“准内接四边形”.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/1551a7f0-2489-4eea-a1d2-1abe5d50502f.png?resizew=466)
(1)如图2,若四边形
是平行四边形,求证:四边形
的“准内接四边形
”为平行四边形;
(2)如图3,若矩形
的“准内接四边形
”是矩形,
,
,求
的长;
(3)如图4,在
中,
,
,
,通过探索发现:随着
、
数量关系的变化,
的“准内接四边形
”是矩形的个数也随之发生变化
请直接写出
、
之间的数量关系及相对应的矩形的个数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d378fea1ac2f8eb93d62aea14c5a6059.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/167d31eb8432b5c0364316e5048c23dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/1551a7f0-2489-4eea-a1d2-1abe5d50502f.png?resizew=466)
(1)如图2,若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
(2)如图3,若矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
(3)如图4,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5228da61bed106b28849ef91a2ec116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aada537209e8ab7626e42b17f68907b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96198405db093eb43952282a69332f92.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07096af3b99fd1cb11c31f19a2c6408e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/27/ed810849-caa1-4329-8ae1-640ff3a471c7.png?resizew=274)
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【推荐3】(1)数学张老师在数学活动课上出示了一道探究题:
如图,在
和
中,
,
,B,C,E三点在同一直线上,A,D两点在
同侧,若
,求证:
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/5da10a09-8dec-4d19-97f5-ee3272ef8f3b.png?resizew=123)
张老师分别从问题的条件和结论出发分析这道探究题:
①如图1,从条件出发:过A作
交
于M,过D作
交
于N,依据等腰三角形的性质“三线合一”分析
与
之间的关系,可证得结论;
②如图2,从结论出发:过D作
交
于P,依据三角形全等的判定,证明
,可证得结论;
请你运用其中一种方法,解决上述问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ea08232f-5ac8-4776-a027-7d57c8b28ee8.png?resizew=286)
(2)小明同学经过对探究题及张老师分析方法的思考,提出以下问题:
如图3,在
中,
,在
中,
,B,C,E三点在同一直线上,A,D两点在
同侧,且A,D,E三点在同一直线上,若
,
,
的面积为7,求
的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/91f1f89b-9a89-4389-a20e-8a241e45a97e.png?resizew=118)
(3)在小明同学的问题得到解决后,张老师针对之前的解题思路提出了下面问题:
如图4,在四边形
中,
,
,点E为
中点,连接
,若
,
,
,求
的长.
如图,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dfa223e7b272346649538457c976864.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/904a9c8e1e111a74eab5818919191ecb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/5da10a09-8dec-4d19-97f5-ee3272ef8f3b.png?resizew=123)
张老师分别从问题的条件和结论出发分析这道探究题:
①如图1,从条件出发:过A作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd7e284eac4b90bfb327de768a7beef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9b9f8078689173b9588d16e4b65b9dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7785afeeaf274892253d04b4f693b367.png)
②如图2,从结论出发:过D作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/844230a06538f3da2f51d8a5cadca06e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/542f98377e2805f5cbf7b4bf40c1623f.png)
请你运用其中一种方法,解决上述问题.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ea08232f-5ac8-4776-a027-7d57c8b28ee8.png?resizew=286)
(2)小明同学经过对探究题及张老师分析方法的思考,提出以下问题:
如图3,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abe4bdc5d9e833b23a1b916c06fc1a35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce25e95729c34d26e482512d36dd89b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65ed8e87249d3c5b9f30a89f5ded4a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0488d2f939ae98e8d4a51e37b91cc062.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/91f1f89b-9a89-4389-a20e-8a241e45a97e.png?resizew=118)
(3)在小明同学的问题得到解决后,张老师针对之前的解题思路提出了下面问题:
如图4,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a755edadca4e4fc27fd49559b8d691ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c59f5c3923354587bf3b08d0538af208.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e5b4ea605cf0b98e428d071f6be6762.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bf7c22116e6736e295d8d7eef9f5471.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2961c2afded1adb0e7a77c65cba0a2e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/56d5f61b-f502-43c4-8a1b-b002660f10cc.png?resizew=187)
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【推荐1】如图,
、
是以
为直径的半圆的两条切线,
与半圆交于点
,连接
,过点
作
,交
于点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8c30c35524b9b0b19833f4ce5cc74e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(1)若弧AE的度数为140º,求的度数;
(2)求证: .
![](https://img.xkw.com/dksih/QBM/2019/1/22/2124245654036480/2125813873647616/STEM/6b1635415cd34b3f926024530c4fc62d.png?resizew=247)
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【推荐2】如图,已知
为⊙
的直径,
为⊙
的一条弦,点
是⊙
外一点
,且
,垂足为点
,交⊙
于点
,
的延长线交⊙
于点
,连接
.
(1)求证:
;
(2)若
,求证:
是⊙
的切线;
(3)若
,
,求⊙
的半径.
![](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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3aa6dff1beaa6f6b8fdcb4ba496bac3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57f8ff9185efe26147aca751fde60afd.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/035180fa4853283e1676c5ee2992426d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f19b297024a1120440bfb98d1a625fef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c18b93be54aadb687f1c740cfaa060d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/26/989c6458-bca1-43d7-ae6a-10b98bf01636.png?resizew=160)
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