如图,在四边形ABCD中,AB∥DC,AB=AD,对角线AC、BD交于点O,AC平分∠BAD,过点C作CE⊥AB交AB延长线于点E,连接OE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/3c9f025a-a9a2-4246-a837-cc6177f244a9.png?resizew=173)
(1)求证:四边形ABCD是菱形;
(2)若
,OE=2,求菱形ABCD的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/3c9f025a-a9a2-4246-a837-cc6177f244a9.png?resizew=173)
(1)求证:四边形ABCD是菱形;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06201e4f55b78d8b30afb257d5a1b16b.png)
更新时间:2022-07-31 17:15:09
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解答题-证明题
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【推荐1】如图,在
中,
,
交于点
,点
,
在
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/0c58f077-6c3a-4ebe-8a5b-e69906ba8d06.png?resizew=268)
(1)求证:
;
(2)若
,点
,
分别为
,
的中点,连接
,
,
,求四边形
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/0c58f077-6c3a-4ebe-8a5b-e69906ba8d06.png?resizew=268)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad93bdc4f5a8ac154d8084080ccf1d82.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b0f0cdb98fe345dccfa96b3be72b31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e42887d9bf31c1dd99f13c39e63c9ab9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f3cdd7a96ec1b5715c16bd0c1e88487.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50e4ceabf0daf448d295489a489a6868.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f3c15b30bd155641e548a7d8c172dd4.png)
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【推荐2】如图1,在矩形
中,点E为对角线
上的一点(不与点A重合).将
沿射线
方向平移到
的位置,点E的对应点为点F.过点E作
,交
的延长线于点G,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/1ebeefcc-fee0-4533-b886-c0ff5b37ab2f.png?resizew=382)
(1)求证:
;
(2)求证:四边形
是平行四边形;
(3)如图2,连接
,若
,
,当
最小时,则
的长为____________________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59b0c3bc854308c01e4a8bb5e0995620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc087498b26dd984e36f16cfe3eb4bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9af464ddb07308be2cd6f02e61fd08eb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db7ea03277f8408fabe5b327cc34838f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/10/1ebeefcc-fee0-4533-b886-c0ff5b37ab2f.png?resizew=382)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54673b0722f7d784f43bbed25009f0a8.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8ee2f15613fb3c76e9a47ce99a176a1.png)
(3)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76d527d4795ece4a5756d1cf8dba31e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f976007b8d754ac3bf5793ed2fce37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11667abcb2759f301391b9850352be.png)
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【推荐1】如图,在△ABC 中,AB=AC,AF⊥BC,BE⊥AC,垂足分别为 F、E,且点 D 是 AB的中点.
(1)求证:DE=DF;
(2)若 BC=6,△DEF 的周长是 7,求 AF 的值.
(1)求证:DE=DF;
(2)若 BC=6,△DEF 的周长是 7,求 AF 的值.
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594246481649664/2597162777206784/STEM/c6593b4fd92e4549ae11e27aead9d630.png?resizew=108)
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【推荐2】在正方形ABCD中,点F是边AB上一点,连接DF,点E为DF中点.连接BE、CE、AE.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932525681860608/2933757979271168/STEM/a124ed890e434b0a85843f97e801820b.png?resizew=122)
(1)求证:△AEB≌△DEC;
(2)当EB=BC时,求∠AFD的度数.
![](https://img.xkw.com/dksih/QBM/2022/3/9/2932525681860608/2933757979271168/STEM/a124ed890e434b0a85843f97e801820b.png?resizew=122)
(1)求证:△AEB≌△DEC;
(2)当EB=BC时,求∠AFD的度数.
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【推荐1】如图,在
中,∠ACB=90⁰,∠B=60⁰,作边AC的垂直平分线
交AB于点D,过点C作AB的平行线交
于点E,判断四边形DBCE的形状,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90b40c2b0ab8e1cfe5112d428b4b829f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/28/e9135933-0137-409f-921b-28df5eba3e90.png?resizew=184)
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【推荐2】如图1,在矩形ABCD中,对角线AC、BD交于点O,过点O作EF,交AD于点F(不与点A、D重合),交BC于点E,连接AE、CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/cf3118ce-b344-4d56-9da3-d611dc51899f.png?resizew=541)
(1)添加条件 (填“①”或“②”)后,四边形AECF是菱形,并加以证明.
①AC=EF ②AC⊥EF
(2)如图2,在菱形AECF中,FH是EC边上的高,仅用一把无刻度的直尺画出FC边上的高EG,不写画法,保留画图痕迹.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/11/cf3118ce-b344-4d56-9da3-d611dc51899f.png?resizew=541)
(1)添加条件 (填“①”或“②”)后,四边形AECF是菱形,并加以证明.
①AC=EF ②AC⊥EF
(2)如图2,在菱形AECF中,FH是EC边上的高,仅用一把无刻度的直尺画出FC边上的高EG,不写画法,保留画图痕迹.
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【推荐1】如图,O为矩形
对角线的交点,
,
.
(1)试判断四边形
的形状,并说明理由;
(2)若
,求四边形
的周长和面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/105068b25f5a63af32f4082cfe08691e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3275b04cb57af1d26fe2562cc4daa445.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/11/bdfbad46-f614-4e4e-a4f9-620ed2789479.png?resizew=180)
(1)试判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0eb9ed77d586a7976de01e7551cdb23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5a6e2ab0a2c893dc495df33e5ee092d.png)
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【推荐2】如图,已知
为矩形
对角线的交点,过点
作DE//AC,过点
作CE//BD,且
、
相交于
点.
![](https://img.xkw.com/dksih/QBM/2018/9/14/2032453651963904/2037370038288384/STEM/6fc67807542e408fac30a312fc29c01f.png?resizew=144)
请你判断四边形
的形状,并说明理由;
若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cb3f9a5da641be35117fd35ba07a6aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6b41d4070854edfaa24071137b314cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2018/9/14/2032453651963904/2037370038288384/STEM/6fc67807542e408fac30a312fc29c01f.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4141b26d2c32655003494a91ad6331b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bee93483c7cb59eba2b676087ee6a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65863c1abad833b79c303bfca24f535c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377f5c10cf527c87ab06bff61384f7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65e34f3fbb1adf23cf81d7005f4387a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92bee93483c7cb59eba2b676087ee6a5.png)
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