【问题初探】:(1)如图①,在
中,点
、
分别在边
、
上,连接
,
∥
,
.若
,则
的长为______;
【问题深入】:(2)如图②,在扇形
中,点
是
上一动点,连接
,
,
,
,求四边形
的面积的最大值;
【拓展应用】:(3)为进一步促进西安市文化和旅游高质量发展,推动全市文明旅游创建工作,结合
年陕西省文明旅游示范单位申报工作,一并开展
年西安市文明旅游示范单位评选工作
某地为参加评选积极改善环境,拟建一个四边形休闲广场
,其大致示意图如图③所示,其中
∥
,
米.点
处设立一个自动售货机,点
是
的中点,连接
,
,
与
交于点
,连接
,沿
修建一条石子小路(宽度不计),将
和
进行绿化.根据设计要求,
.为倡导绿色新风尚,现要使绿化的面积尽可能的大,请问
和
的面积之和是否存在最大值?若存在,请求出
和
面积之和的最大值;若不存在,请说明理由.
![](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/2a30f3a8b673cc28bd90c50cf1a35281.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/e6e490f703eb6c9bb1278c78ebc2d661.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/50196d293a863fe2f9e46199052ab8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a19338598965bb3856cdd0236bbf694.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
【问题深入】:(2)如图②,在扇形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4819c39c281427826e1b3f7a4c2b720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ff5c21185c13eae675906dabd3593c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ea16ceca816f7d3d50650af141baf42.png)
【拓展应用】:(3)为进一步促进西安市文化和旅游高质量发展,推动全市文明旅游创建工作,结合
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e946baf1316ac1f219398ecedadf6cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54e1d0f65817ba32a732040518f41440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/e5b697b4b6230d62b428fce3c27571ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.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/0fc963e25d03b5c552bc063e44835364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376ca8f6e81ccd6846145ada511c4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3df364013269114330c0eff2d2c65a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc963e25d03b5c552bc063e44835364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376ca8f6e81ccd6846145ada511c4749.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fc963e25d03b5c552bc063e44835364.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376ca8f6e81ccd6846145ada511c4749.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/20/d921fc65-dd48-4845-9c40-6be8a69c71c7.png?resizew=589)
2023·陕西咸阳·二模 查看更多[2]
更新时间:2023-05-17 22:55:45
|
相似题推荐
解答题-证明题
|
较难
(0.4)
【推荐1】如图,等边
内接于
,
是
上任一点(点
不与点
、
重合),连接
、
,过点
作
交
的延长线于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/920db0f9-6bff-41d5-be25-88015bd7b7a8.png?resizew=179)
(1)求
和
的度数;
(2)求证:
;
(3)若
,
,求四边形
的面积;
(4)在(3)的条件下,求
的长度.
![](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/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e93d10be28a89f3546406e0cc0563529.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/20/920db0f9-6bff-41d5-be25-88015bd7b7a8.png?resizew=179)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac3c1375c64dceef45846308a418cf7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0433f8116768b42642a7f7e5977ce6.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8808952cf00736767d112bb828b632.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcc532cfe64300cb3da9e04a307c957a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8825d400f453c5c17a7beeb1cc9a9cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92a30b8b117e1ab217d76052a6fcc28.png)
(4)在(3)的条件下,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
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名校
【推荐2】如图,∠BAC的平分线交△ABC的外接圆于点D,交BC于点F,∠ABC的平分线交AD于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4217a1c8-7601-42bd-8a96-6cd5ae0c2b41.png?resizew=134)
(1)求证:DE=DB:
(2)若∠BAC=90°,BD=4,求△ABC外接圆的半径;
(3)若BD=6,DF=4,求AD的长
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/21/4217a1c8-7601-42bd-8a96-6cd5ae0c2b41.png?resizew=134)
(1)求证:DE=DB:
(2)若∠BAC=90°,BD=4,求△ABC外接圆的半径;
(3)若BD=6,DF=4,求AD的长
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解答题-问答题
|
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【推荐3】问题探究
(1)如图1,AB是半圆O的直径,AB=8.P是
上一点,且
=2
,连接AP,BP.∠APB的平分线交AB于点C,过点C分别作CE⊥AP、CF⊥BP,垂足分别为E、F.求线段CF的长.
问题解决
(2)如图2,是某公园内“青少年活动中心”的设计示意图.已知⊙O的直径AB=70m,点C在⊙O上,且CA=CB.在AB上任取一点P,连接CP并延长,交⊙O于点D,连接AD、BD.过点P分别作PE⊥AD、PF⊥BD,垂足分别为E、F.按设计要求,四边形PEDF内部为室内活动区,阴影部分是户外活动区,圆内其余部分为绿化区.设AP的长为x(m),阴影部分的面积为y(m2).
①求y与x之间的函数关系式;
②按照“青少年活动中心”的设计要求,发现当AP的长度为30m时,整体布局比较合理.当AP=30m时,试求室内活动区(四边形PEDF)的面积.
(1)如图1,AB是半圆O的直径,AB=8.P是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3236e8737e7856627067c0a9606635f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0164156dbf563441afe174502adc79ee.png)
问题解决
(2)如图2,是某公园内“青少年活动中心”的设计示意图.已知⊙O的直径AB=70m,点C在⊙O上,且CA=CB.在AB上任取一点P,连接CP并延长,交⊙O于点D,连接AD、BD.过点P分别作PE⊥AD、PF⊥BD,垂足分别为E、F.按设计要求,四边形PEDF内部为室内活动区,阴影部分是户外活动区,圆内其余部分为绿化区.设AP的长为x(m),阴影部分的面积为y(m2).
①求y与x之间的函数关系式;
②按照“青少年活动中心”的设计要求,发现当AP的长度为30m时,整体布局比较合理.当AP=30m时,试求室内活动区(四边形PEDF)的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/7e16a063-46ed-4030-a529-0dea9dd470a5.png?resizew=399)
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【推荐1】已知,在菱形ABCD中,∠BCD=60°,将边CD绕点C顺时针旋转α°(0<α<120),得到线段CE,连接ED、ED或其延长线交∠BCE的角平分线于点F.
(1)如图1,若α=20,直接写出∠E与∠CFE的度数;
(2)如图2,若60<α<120.求证:EF﹣DF=CF;
(3)如图3,若AB=6,点G为AF的中点,连接BG,则DC旋转过程中,BG的最大值为 .
(1)如图1,若α=20,直接写出∠E与∠CFE的度数;
(2)如图2,若60<α<120.求证:EF﹣DF=CF;
(3)如图3,若AB=6,点G为AF的中点,连接BG,则DC旋转过程中,BG的最大值为 .
![](https://img.xkw.com/dksih/QBM/2021/11/17/2852987230945280/2863662215798784/STEM/65990325-d823-4851-b40f-76e81c09595e.png)
您最近一年使用:0次
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【推荐2】(1)如图1,已知线段a,请用无刻度的直尺和圆规作Rt△ABC,使斜边AB=a,∠A=30°;
(2)如图2,已知矩形MNPQ中,MN=6,若在边PQ上存在一点D,使∠MDN=30°,则边NP长度的取值范围是 .
(2)如图2,已知矩形MNPQ中,MN=6,若在边PQ上存在一点D,使∠MDN=30°,则边NP长度的取值范围是 .
![](https://img.xkw.com/dksih/QBM/2021/5/27/2730172308758528/2743619451387904/STEM/9bdbaec4-644c-454f-b6fb-3ca36deb4baf.png)
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(0.4)
【推荐3】新定义:如图1(图2,图3),在
中,把
边绕点A顺时针旋转,把
边绕点A逆时针旋转,得到
,若
,我们称
是
的“旋补三角形”,
的中线
叫做
的“旋补中线”,点A叫做“旋补中心”.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/08b80fda-70a5-43fb-b039-e28c664d9947.png?resizew=518)
【特例感知】
(1)①若
是等边三角形(如图2),
,则
______________.
②若
(如图3),
,
_____________.
【猜想论证】
(2)在图1中,当
是任意三角形时,猜想
与
的数量关系,并证明你的猜想;(提示:过点
作
且
,连接
,则四边形
是平行四边形)
【拓展应用】
(3)如图4,点A,B,C,D都在半径为5的圆P上,且
与
不平行,
,
是
的“旋补三角形”,点P是“旋补中心”,求BC的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9e69184c9a84c8aa4483d447d51695.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c021993da445858448d368df42554c8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/08b80fda-70a5-43fb-b039-e28c664d9947.png?resizew=518)
【特例感知】
(1)①若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
【猜想论证】
(2)在图1中,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/759a864313f66e2cd26713e11cdcb9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79ac3b64bede56fd018f9bd08ebd938f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a83ccde054ec5f3473ede6c07e484290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5faa488659402e00684cf5757ef8c.png)
【拓展应用】
(3)如图4,点A,B,C,D都在半径为5的圆P上,且
![](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/267ace52b64e1e7dfc5211e033255b7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7fbd6b9f85c086ac95562fe45e8d969.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4234cf4d8159f5df0333bcc269ffe099.png)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
【推荐1】如图,
为
的直径,
为弦,
为
的切线,C为切点,点E在
上,
.连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/43797da5-50c1-4603-b872-74bb69dc10d9.png?resizew=181)
(1)求证:
;
(2)若
,求
的长.
![](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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0105d0889f6fa9cb5430cf9e09337173.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/9/43797da5-50c1-4603-b872-74bb69dc10d9.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d5ee2d6fcbcad17b69997ef0741d2d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f1f00915289b841bc2e4ba718e18c51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
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【推荐2】如图,正方形ABCD的对角线相交于点O,∠CAB的平分线分别交BD、BC于E、F,作BH⊥AF于点H,分别交AC、CD于点G、P,连结GE、GF.
(1)试判断四边形BEGF的形状并说明理由.
(2)求
的值.
(1)试判断四边形BEGF的形状并说明理由.
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9942f6ca3b154fda53ce7b73c9accf33.png)
![](https://img.xkw.com/dksih/QBM/2019/3/29/2170900404584448/2177379665035264/STEM/5ca4fa3931064e26a7328b1091dc6d2f.png?resizew=100)
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【推荐1】如图,在平面直角坐标系
中,抛物线
与直线
分别交于
轴、
轴上的
两点,设该抛物线与
轴的另一个交点为点
,顶点为点
,联结
交
轴于点
.
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190763714813952/2190897586946048/STEM/bb04e6bdea014091a1dc27d2c7319c3a.png?resizew=190)
求该抛物线的表达式及点
的坐标;
求
的正切值;
如果点
在
轴上,且
,求点
的坐标.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f18269e4b2c08f69b719c4c7e7d71733.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d73ecfaeac5db3976fe465b6f3ea977e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab609a6574633ebabcff3e73fa862081.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2019/4/26/2190763714813952/2190897586946048/STEM/bb04e6bdea014091a1dc27d2c7319c3a.png?resizew=190)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bf6c84731e5e1bd335ecfc2d36c3d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f53190d6ead827a6338b9de847aeaf1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3702b5620dbee356a8e560c78d223ad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f62295c36d2e2174908c2bec0eb5b30f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/386d7e689463b7a05b5d770540e96f8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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名校
【推荐2】在△ABC中,
,
,点M,N分别是AC,BC的中点,点P是直线MN上一点,连接AP,将线段PA绕点P顺时针旋转
得到线段PQ,连接AQ,CQ.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2973399793041408/2982136195915776/STEM/9c3a7f49cf924100992cd6d1744e36f9.png?resizew=430)
(1)【问题发现】如图1,当点P与点M重合时,线段CQ与PN的数量关系是 ,∠ACQ= °.
(2)【探究证明】当点P在射线MN上运动时(不与点N重合),(1)中结论是否一定成立?请利用图2中的情形给出证明.
(3)连接PC,当△PCQ是等边三角形时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8e9ec412ea0355e4e5cd06c60e5fee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2ff7caec4fdd8fb54a3ffbff9692414.png)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2973399793041408/2982136195915776/STEM/9c3a7f49cf924100992cd6d1744e36f9.png?resizew=430)
(1)【问题发现】如图1,当点P与点M重合时,线段CQ与PN的数量关系是 ,∠ACQ= °.
(2)【探究证明】当点P在射线MN上运动时(不与点N重合),(1)中结论是否一定成立?请利用图2中的情形给出证明.
(3)连接PC,当△PCQ是等边三角形时,请直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9152b9d571e4a595e63ab4a6c3505a.png)
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【推荐3】如图,在Rt△ABC中,∠C=90°,AC=6,BC=8,四边形PDEF是矩形,PD=2,PF=4,DE与AB边交于点G,点P从点B出发沿BC以每秒1个单位长的速度向点C匀速运动,伴随点P的运动,矩形PDEF在射线BC上滑动;点Q从点P出发沿折线PD﹣DE以每秒1个单位长的速度匀速运动.点P,Q同时出发,当点Q到达点E时停止运动,点P也随之停止.设点P,Q运动的时间是t秒(t>0)
(1)当t=1时,QD= ,DG= ;
(2)当点Q到达点G时,求出t的值;
(3)t为何值时,△PQC是直角三角形?
(1)当t=1时,QD= ,DG= ;
(2)当点Q到达点G时,求出t的值;
(3)t为何值时,△PQC是直角三角形?
![](https://img.xkw.com/dksih/QBM/2018/10/1/2043866577027072/2044414613446656/STEM/750a4aac-2cfb-4bc2-b42b-09e36b122d97.png)
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