已知:在△ABC中,∠BAC=90°,AB=AC,点D为直线BC上一动点(点D不与B、C重合).以AD为边作正方形ADEF,连接CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/c7139dcc-c91c-444a-8c06-4b86f1eac6df.jpg?resizew=565)
(1)如图①,当点D在线段BC上时,求证:
.
(2)如图②和③,当点D在线段BC的延长线上或反向延长线上时,其它条件不变,请判断CF、BC、CD三条线段之间的关系,并证明之;
(3)如图③,若连接正方形ADEF对角线AE、DF,交点为O,连接OC,探究△AOC的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/5/c7139dcc-c91c-444a-8c06-4b86f1eac6df.jpg?resizew=565)
(1)如图①,当点D在线段BC上时,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b698e4e245ea6095ca4b128f3ac62a3.png)
(2)如图②和③,当点D在线段BC的延长线上或反向延长线上时,其它条件不变,请判断CF、BC、CD三条线段之间的关系,并证明之;
(3)如图③,若连接正方形ADEF对角线AE、DF,交点为O,连接OC,探究△AOC的形状,并说明理由.
21-22八年级下·广东汕头·期末 查看更多[3]
广东省汕头市澄海区2021-2022学年八年级下学期期末考试数学试题2023年陕西省西安市第五十八中学中考数学模拟试卷(已下线)期末难点特训(三)与平行四边形有关的压轴题-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(人教版)
更新时间:2022-06-25 22:51:03
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解答题-证明题
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名校
【推荐1】如图,在
中,
,以
为边作等边
,连接
.
(1)如图1,若
,求
的面积;
(2)如图2,若
,点
为
中点,连接
,且
,延长
至点
,连接
,使得
,求证:
;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(1)如图1,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e0c5213d01866052c11d3c6e30be17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60fbe19834ba513c9215a5237f6b7b01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5113ac6e656002f2d110f08ed753e9e0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
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解答题-证明题
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【推荐2】如图,AB、CD是⊙O的两条互相垂直的直径,E是
上一点,连接AE,作OG∥AE交CE于点G.
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322396651126784/2325136443195392/STEM/b5cfc95d85714b23b1be40b921ac5d77.png?resizew=319)
(1)求证:BE=
EG;
(2)判断AE与CG的数量关系,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://img.xkw.com/dksih/QBM/2019/10/29/2322396651126784/2325136443195392/STEM/b5cfc95d85714b23b1be40b921ac5d77.png?resizew=319)
(1)求证:BE=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(2)判断AE与CG的数量关系,并证明.
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【推荐1】如图,AB是
的直径,D是AB上的一点,C是
上的一点,过点D作AB的垂线,与过点C的切线相交于点P,PD与AC相交于点E.
(1)求证:
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(2)连接BC,若
,
,
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的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f944f78358763be992bb3d55fff12f2.png)
(2)连接BC,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcfb6ce695187d788d4c3d73db75f1ac.png)
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【推荐2】如图1,在
中,
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是
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作
于
,
是线段
上一点,使得
,在线段
上取点
、
(点
在
之间),
,且
,当点
从点
匀速运动到点
时,点
恰好从点
匀速运动到点
.记
,
,已知
.
![](https://img.xkw.com/dksih/QBM/2021/7/6/2758635263426560/2767566285135872/STEM/c8f29989-8770-42ae-9d6a-30da33a283f8.png?resizew=366)
(1)
______,
______;
(2)①判断
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②若
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是平行四边形.
(3)如图2,若
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①当
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(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16ca90e8a784f990c4097eec9219908d.png)
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(2)①判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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②若
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(3)如图2,若
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①当
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②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23dd5d7bdfef4e4b39667dafab026b6.png)
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【推荐1】(1)如图①,在正方形ABCD中,点E,F分别是边BC,CD上的点,BE=CF,AF,DE交于点G.求证:AF⊥DE且AF=DE;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/f2de4992-ecfe-47e8-9c6e-85507fad667b.png?resizew=432)
(2)点E,F分别在边CB,DC的延长线上,且BE=CF.(1)中结论是否也成立?如果成立,请写出证明;如果不成立,请写出理由;
(3)在(2)的基础上,连接AE,EF,分别取AE,EF,FD,AD的中点M,N,P,Q,请判断四边形MNPQ的形状,并写出证明.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/7/f2de4992-ecfe-47e8-9c6e-85507fad667b.png?resizew=432)
(2)点E,F分别在边CB,DC的延长线上,且BE=CF.(1)中结论是否也成立?如果成立,请写出证明;如果不成立,请写出理由;
(3)在(2)的基础上,连接AE,EF,分别取AE,EF,FD,AD的中点M,N,P,Q,请判断四边形MNPQ的形状,并写出证明.
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【推荐2】如图1,四边形
是正方形,
,连接
,
是等腰直角三角形,
,
交
于点M.
交
边于点H,连接
,求证:
;
(2)若
,求
;
(3)如图2,若
交直线
于点N,
交
于点P,交
的延长线于点G,连接
,若P是
的中点,求
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
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![](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/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78acc30f168b35752ee57a4cb6e44aca.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f79e482d948bc813afde84be7ba96793.png)
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(3)如图2,若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff4a63d14654c66cc71bf26293d698ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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