如图,在正方形ABCD中,E是以AB为直径的⊙O上一点,连接AE并延长,交BC边于点F,连接BE并延长,交CD边于点G,过点E作⊙O的切线交BF于点M.
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966589032087552/2969175276552192/STEM/e16bf58f-49d6-47e1-be34-d98799d94420.png?resizew=177)
(1)求证:CF=DG;
(2)若⊙O的直径为4,DG=1,求EM的长(请用两种方法解答)
![](https://img.xkw.com/dksih/QBM/2022/4/26/2966589032087552/2969175276552192/STEM/e16bf58f-49d6-47e1-be34-d98799d94420.png?resizew=177)
(1)求证:CF=DG;
(2)若⊙O的直径为4,DG=1,求EM的长(请用两种方法解答)
更新时间:2022-04-30 09:45:28
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解答题-证明题
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【推荐1】如图,正方形ABCD的边长为6,点E,点F分别在边AB,AD上,AE=DF=2,连接DE,CF交于点G.连接AC与DE交于点M,延长CB至点K,使BK=3,连接GK交AB于点N.
(1)求证:CF⊥DE;
(2)求△AMD的面积;
(3)请直接写出线段GN的长.
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【推荐2】如图,在正方形
中,对角线
与
相交于点O,点E是
上的一个动点,连接
,交
于点F.
时,求
;
(2)如图②当
平分
时,求证:
;
(3)如图③,当点E是
的中点时,过点F作
于点G,求证:
.
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(2)如图②当
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d16fab0f52c8af5abba0bf19a06ea0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af3b8a7bab9e352251476603371c5590.png)
(3)如图③,当点E是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7699dd30e08702bfc6499eb9c89e54a.png)
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解答题-作图题
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【推荐1】如图,在每个小正方形的边长为1的网格中,
的顶点A、B、C均在格点上,请用无刻度的直尺完成作图(保留作图痕迹).
(1)如图1,在
中作高
交边
于点
;作
的角平分线
交边
于点
;
(2)如图2,在
边上截
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e76a14d28c0a95fc678986845bd8efb5.png)
;以
为直径构造半圆交
于点
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的对称点
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(1)如图1,在
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
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(2)如图2,在
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解题方法
【推荐2】如图1,在△ABC中,AB=AC=2,∠BAC=90°,点P为BC边的中点,直线a经过点A,过B作BE⊥a,垂足为E,过C作CF⊥a,垂足为F,连接PE、PF.
(1)当点B、P在直线a的异侧时,延长EP交CF于点G,猜想线段PF和EG的数量关系为_____;
(2)如图2,直线a绕点A旋转,当点BP在直线a的同侧时,若(1)中其它条件不变,(1)中的结论还成立吗?若成立,请给予证明;若不成立,请说明理由;
(3)直线a绕点A旋转一周的过程中,当线段PF的长度最大时,请判断四边形BEFC的形状,并求出它的面积.
(1)当点B、P在直线a的异侧时,延长EP交CF于点G,猜想线段PF和EG的数量关系为_____;
(2)如图2,直线a绕点A旋转,当点BP在直线a的同侧时,若(1)中其它条件不变,(1)中的结论还成立吗?若成立,请给予证明;若不成立,请说明理由;
(3)直线a绕点A旋转一周的过程中,当线段PF的长度最大时,请判断四边形BEFC的形状,并求出它的面积.
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【推荐1】如图,在
中,
,以
为直径的
交
于点M,交
于点D,过点C作
的切线交
的延长线于点P.
(1)求证:
;
(2)若
,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,在
中,
为
的直径,C为
上一点,
为
的平分线交
于点D,连接
交BC于点E,过点A作
的切线交
延长线于点F,过点D作
,交
于点 G.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/19/a863283e-6b26-469b-92c7-8ec03809614f.png?resizew=154)
(1)求证∶
;
(2)连接
,若
,请判断四边形
的形状,并证明你的结论;
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的长.
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(1)求证∶
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdbab840d528f4ce7a9ef87e8446f84e.png)
(2)连接
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(3)若
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名校
【推荐1】(1)问题提出:如图1,折叠矩形
,使点D落在
边上的点F处,折痕为
.若
,
,求
的面积.
(2)问题解决:某市进行河滩治理,优化、美化人居生态环境.如图2,在河畔的一处滩地上规划一个五边形河畔公园
.按设计要求,要在五边形河畔公园
内挖一个三角形人工湖
,使点M,N分别在边
上,
的面积为
平方米,且满足
,
.已知五边形
中,
,
米.请问是否存在符合设计要求面积的
?若存在,求此时
的长;若不存在,请说明理由.
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(2)问题解决:某市进行河滩治理,优化、美化人居生态环境.如图2,在河畔的一处滩地上规划一个五边形河畔公园
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9142a8490de14a87eda628ffa7e28982.png)
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【推荐2】综合探究
如图,
中,
,
于D,过点D作
,
边DE上的中线BF延长线交AC于点G,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/aba1af35-5691-4043-8c87-5820e24cdb93.png?resizew=242)
(1)求证:
;
(2)若
,求
;
(3)在(2)的条件下,若
,则BD的长度为 .
如图,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f2281cb6df0c3c518ce5ed19a02b57e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/13/aba1af35-5691-4043-8c87-5820e24cdb93.png?resizew=242)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/780f430b4cca0491efb180ea5a79027f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b81df15c5023b05e170cab718777105.png)
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(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c2202d9071a4a53bb61b1237269e537.png)
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