如图1,在正方形ABCD中,E、F两点分别在边AD和BC上,CH⊥EF于点G,交AB于点H
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992687417958400/2994064693198848/STEM/9d54acf4-beff-42bf-a014-87464497a11a.png?resizew=547)
(1)求证:EF=CH;
(2)如图2,过G作AD的垂线分别交AD、BC于I、K两点,求证:BH=EI+FK;
(3)如图3,若F、M和N三点分别为BC、EF和CH的中点,AE=5DE,求MN:AB的值;
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992687417958400/2994064693198848/STEM/9d54acf4-beff-42bf-a014-87464497a11a.png?resizew=547)
(1)求证:EF=CH;
(2)如图2,过G作AD的垂线分别交AD、BC于I、K两点,求证:BH=EI+FK;
(3)如图3,若F、M和N三点分别为BC、EF和CH的中点,AE=5DE,求MN:AB的值;
2022·安徽合肥·三模 查看更多[4]
2022年安徽省合肥市瑶海区中考三模(统考)数学试题2022年安徽省合肥市瑶海区合肥市第三十八中学三模数学试题 (已下线)专题07 几何图形的性质-5年(2018-2022)中考1年模拟数学分项汇编(安徽专用)(已下线)专题1.15 特殊平行四边形(全章分层练习)(培优练)-2023-2024学年九年级数学上册基础知识专项突破讲与练(北师大版)
更新时间:2022-06-04 13:43:07
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【推荐1】(1)如图1,点O是等边
的内心,
的两边分别交
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的边长为6,求四边形
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(2)为培养学生劳动实践能力,某学校计划在校东南角开辟出一块平行四边形劳动实践基地.如图2所示,劳动实践基地为
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的面积最大.求满足规划要求的三条小路
总长的最小值,并计算同时满足四边形
面积最大时学校应开辟的劳动实践基地
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【推荐2】在平面直角坐标系中,点O为坐标原点,纵坐标为a的点A在y轴上,横坐标为b的点B在x轴上,实数a,b满足|a+b﹣8|+(3a﹣2b+1)2=0
(1)求a,b的值;
(2)如图1,第一象限的点P在∠AOB的平分线OC上,过点P作x轴的垂线,点D为垂足,设线段PD的长为d,△PAB的面积为S(S≠0)用含d的式子表示S,并直接写出相应的d的范围
(3)在(2)的条件下,如图2,当PA⊥PB时,点E在x轴上,连接PE,∠APE=2∠ABO,求PE的长.
(1)求a,b的值;
(2)如图1,第一象限的点P在∠AOB的平分线OC上,过点P作x轴的垂线,点D为垂足,设线段PD的长为d,△PAB的面积为S(S≠0)用含d的式子表示S,并直接写出相应的d的范围
(3)在(2)的条件下,如图2,当PA⊥PB时,点E在x轴上,连接PE,∠APE=2∠ABO,求PE的长.
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【推荐1】如图,
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(1)求证:
;
(2)若
,
,求四边形AEDF的周长.
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(2)若
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【推荐2】如图1,
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为
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的中点.
(1)求证:
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与
交于点G,连接
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(1)求证:
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(2)将
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(3)连接
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【推荐1】问题提出:
(1)如图1,在四边形ABCD中,AB=BC,AD=CD=3,∠BAD=∠BCD=90°,∠ADC=60°,则四边形ABCD的面积为 ;
问题探究:
(2)如图2,在四边形ABCD中,∠BAD=∠BCD=90°,∠ABC=135°,AB=2
,BC=3,在AD、CD上分别找一点E、F,使得△BEF的周长最小,并求出△BEF的最小周长;
问题解决:
(3)如图3,在四边形ABCD中,AB=BC=2,CD=10,∠ABC=150°,∠BCD=90°,则在四边形ABCD中(包含其边沿)是否存在一点E,使得∠AEC=30°,且使四边形ABCE的面积最大.若存在,找出点E的位置,并求出四边形ABCE的最大面积;若不存在,请说明理由.
(1)如图1,在四边形ABCD中,AB=BC,AD=CD=3,∠BAD=∠BCD=90°,∠ADC=60°,则四边形ABCD的面积为 ;
问题探究:
(2)如图2,在四边形ABCD中,∠BAD=∠BCD=90°,∠ABC=135°,AB=2
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问题解决:
(3)如图3,在四边形ABCD中,AB=BC=2,CD=10,∠ABC=150°,∠BCD=90°,则在四边形ABCD中(包含其边沿)是否存在一点E,使得∠AEC=30°,且使四边形ABCE的面积最大.若存在,找出点E的位置,并求出四边形ABCE的最大面积;若不存在,请说明理由.
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【推荐2】如图,
,
,
,
,
,
是
上一动点,设
.
(1)用
表示
;
(2)当
为何值时,
;
(3)代数式
是否有最小值,若有请求出最小值,若没有请说明理由
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(1)用
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(2)当
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【推荐3】如图是某兴趣小组自制的画圆工具的侧面示意图.
,桶高
.两根直木棍
分别长
和
,木棍EF直立于水平面,木棍
沿桶壁
插在桶内.用一条长
的细绳连接P,E并拉直.
【工具使用】移动木棍
,使点F绕点C旋转一周画圆.经多次操作发现,为使木棍
能稳定直立于细沙中,需满足
.
问题1:当
长为多少时,画出的圆的半径为
?
问题2:设
为x,画出的圆的半径为r,求r关于x的函数表达式与r的最大值.
问题3:以下是两位组员的对话,请根据对话解决问题.
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【工具使用】移动木棍
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问题1:当
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问题2:设
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问题3:以下是两位组员的对话,请根据对话解决问题.
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【推荐1】如图1,正方形ABCD中,E是AB边上一点,F是对角线BD上一点,且∠ECF=45°,连接AC.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644230275072/2969287627259904/STEM/fb9f82f77fb84859a93c0ee27f63e49a.png?resizew=319)
(1)证明:∠ACE=∠DCF;
(2)证明:BE+
DF=BC;
(3)如图2,若将条件“正方形ABCD”改为“菱形ABCD,且∠ABC=60°”,同时设点E在AB延长线上,F是对角线BD上一点,且满足∠ECF=30°,请直接写出BE,DF和BC之间的数量关系.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966644230275072/2969287627259904/STEM/fb9f82f77fb84859a93c0ee27f63e49a.png?resizew=319)
(1)证明:∠ACE=∠DCF;
(2)证明:BE+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(3)如图2,若将条件“正方形ABCD”改为“菱形ABCD,且∠ABC=60°”,同时设点E在AB延长线上,F是对角线BD上一点,且满足∠ECF=30°,请直接写出BE,DF和BC之间的数量关系.
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【推荐2】如图1,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/2022/9/24/4b076001-79a7-4604-bf21-8de5f2e19dac.png?resizew=402)
(1)概念理解:给出下列图形:①平行四边形;②矩形;③菱形;④正方形.其中一定是“垂美四边形”的是 (填序号);
(2)性质探究:如图1,四边形ABCD的对角线AC、BD交于点O,AC⊥BD.求证:AB2+CD2=AD2+BC2;
(3)解决问题:如图2,分别以Rt△ACB的直角边AC和斜边AB为边向外作正方形ACFG和正方形ABDE,连接CE,BG,GE.已知AC=
,AB=3
①请问四边形CGEB是垂美四边形吗?并说明理由;
②求GE的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/4b076001-79a7-4604-bf21-8de5f2e19dac.png?resizew=402)
(1)概念理解:给出下列图形:①平行四边形;②矩形;③菱形;④正方形.其中一定是“垂美四边形”的是 (填序号);
(2)性质探究:如图1,四边形ABCD的对角线AC、BD交于点O,AC⊥BD.求证:AB2+CD2=AD2+BC2;
(3)解决问题:如图2,分别以Rt△ACB的直角边AC和斜边AB为边向外作正方形ACFG和正方形ABDE,连接CE,BG,GE.已知AC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
①请问四边形CGEB是垂美四边形吗?并说明理由;
②求GE的长.
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