如图,
中,
cm,
cm,
,G是
的中点,E是边
上的动点,
的延长线与
的延长线交于点F,连接
,
.
(1)求证:四边形
是平行四边形;
(2)若四边形
是矩形,求
的长度;
(3)当
=______cm时,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/25/245d7427-2d9d-4e6e-aee5-085349234e7f.png?resizew=179)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
更新时间:2023-06-17 15:58:28
|
相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,在
中,
是直径,
是弦,
的平分线交
于点C,过点C作
,交
的延长线于点E.
![](https://img.xkw.com/dksih/QBM/2023/2/16/3175886252613632/3177636218159104/STEM/30e7b740948941f0b5e17744db490ac2.png?resizew=143)
(1)求证:
是
的切线;
(2)若D是弧
的中点,
.求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://img.xkw.com/dksih/QBM/2023/2/16/3175886252613632/3177636218159104/STEM/30e7b740948941f0b5e17744db490ac2.png?resizew=143)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若D是弧
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54275b7e571660d0a9e0370fbfe5050b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐2】如图,
中,
,
,点P在AB上,
,垂足为Q.操作:画出点B关于直线PQ的对称点
,连接
交AC于点D.以
为圆心,
长为半径画弧,交BA延长线于点E,连接
.
(1)依题意补全图形;
(2)求
的度数;
(3)若
,求
的值(用含k的式子表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56d3c9ce32b721995f355eea411340e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/902f24325565a9dd95128a633a240da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/96c10cd9fe2cec68681f6246f23420f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3953cec61ac602ce5eb59b7912352179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cd77faaa1eaf374b6b23c6f9a4ac3b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9601d29de0a884953b039ee72f0158fe.png)
(1)依题意补全图形;
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c562f35d37deaa855e69d6616a6dc801.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/379e28b2091b3da46a9cfaae684f37f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/954f1cec08ff87d3d395aa64ce405c01.png)
![](https://img.xkw.com/dksih/QBM/2021/1/7/2631199507947520/2634533174263808/STEM/494d35c9-4d38-46f9-9190-02d055cf3d20.png)
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解答题-作图题
|
适中
(0.65)
名校
【推荐1】如图,在平行四边形ABCD中AD>AB.
(2)在(1)所作图形中,连接BE,求证:四边形BEDF是平行四边形.(请补全下面的证明过程,不写证明理由).
证明:∵DF平分∠ADC,
∴
∵在平行四边形ABCD中,BC
AD,
∴
∴∠CDF=∠CFD,
∴CD=CF.
∵在平行四边形ABCD中,AB=CD,
又∵AE=AB,
∴AE=CF.
∵在平行四边形ABCD中,AD=BC,
∴AD﹣AE=BC﹣CF,
即
又∵
∴四边形BEDF是平行四边形.
(2)在(1)所作图形中,连接BE,求证:四边形BEDF是平行四边形.(请补全下面的证明过程,不写证明理由).
证明:∵DF平分∠ADC,
∴
∵在平行四边形ABCD中,BC
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
∴
∴∠CDF=∠CFD,
∴CD=CF.
∵在平行四边形ABCD中,AB=CD,
又∵AE=AB,
∴AE=CF.
∵在平行四边形ABCD中,AD=BC,
∴AD﹣AE=BC﹣CF,
即
又∵
∴四边形BEDF是平行四边形.
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解答题-证明题
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适中
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【推荐2】已知:如图,△ABC中,点D、E、F分别在边AB、BC、AC上,且DE∥AC,
=
.
(1)求证:DF∥BC;
(2)如果DF=2,BE=4,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ca07b4b1d1d30ebf0a5a402ad8aeecf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/635f5ed4fb882c3272c82f5ea09f3ef0.png)
(1)求证:DF∥BC;
(2)如果DF=2,BE=4,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01b9f1ca207fb4550c8c78cf782453ab.png)
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解答题-问答题
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适中
(0.65)
【推荐3】如图,在 13×7 的网格中,每个小正方形边长都是 1,其顶点叫做格点,如图 A、B、D、E 均为格点,
ABD 为格点三角形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/dd51f48b-bb00-449b-a5d6-99c18f33ca65.png?resizew=393)
(1)请在给定的网格中画▱ ABCD,要求 C 点在格点上;
(2)在(1)中▱ ABCD 右侧,以格点 E 为其中的一个顶点,画格点
EFG,并使 EF=5,FG=3,EG=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(3)先将(2)中的线段 EF 向右平移 6 个单位、再向下平移 l 个单位到 MP 的位置,再以 MP 为对角线画矩形 MNPQ(M、N、P、Q 按逆时针方向排列),直接写出矩形 MNPQ 的面积为 ______
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/dd51f48b-bb00-449b-a5d6-99c18f33ca65.png?resizew=393)
(1)请在给定的网格中画▱ ABCD,要求 C 点在格点上;
(2)在(1)中▱ ABCD 右侧,以格点 E 为其中的一个顶点,画格点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(3)先将(2)中的线段 EF 向右平移 6 个单位、再向下平移 l 个单位到 MP 的位置,再以 MP 为对角线画矩形 MNPQ(M、N、P、Q 按逆时针方向排列),直接写出矩形 MNPQ 的面积为 ______
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解答题-问答题
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适中
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【推荐1】如图,矩形窗户边框
由矩形
,矩形
,矩形
组成,其中
.已知制作此窗户边框的材料的总长是6米,设
(米);窗户边框
的面积为S(米
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(1)用含x的代数式表示
.
(2)求当S取得最大值时,
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/921ef5abce73648e3834140df9a72aa8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/babbc9f9-00df-4150-92df-71a4a2414e17.png?resizew=181)
(1)用含x的代数式表示
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
(2)求当S取得最大值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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适中
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【推荐2】如图,在矩形
中,E,F分别为边
,
上的点.
,对角线
平分
.
(1)求证;四边形
为菱形;
(2)已知
,
,求线段BF的长.
![](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/d8ce1475f537b4ad21775bfaa16daa0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/beb3748300134501953d6b1c3a905026.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/13/3cb8a985-9d16-4c24-bcce-0530b5745f31.png?resizew=158)
(1)求证;四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b939af5ba06e279cce39396aaf0fae06.png)
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解答题-问答题
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适中
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【推荐1】如图,矩形ABCD中,AB=8,BC=4.点E在边AB上,点F在边CD上,点G、H在对角线AC上.若四边形EGFH是菱形,求AE的长.
![](https://img.xkw.com/dksih/QBM/2021/8/13/2785039440314368/2785363658883072/STEM/391c19455100449c94a66a4451ac711b.png?resizew=151)
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解答题-作图题
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适中
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名校
【推荐2】如图,在菱形ABCD中,CE⊥AB,
(1)若∠B=45°,BC=10,求AE的长度;
(2)在菱形ABCD中,请仅用无刻度直尺画出BC边上的高AF(保留作图痕迹,不写作法,题目要求画的线画实线,其他的线画虚线).
(1)若∠B=45°,BC=10,求AE的长度;
(2)在菱形ABCD中,请仅用无刻度直尺画出BC边上的高AF(保留作图痕迹,不写作法,题目要求画的线画实线,其他的线画虚线).
![](https://img.xkw.com/dksih/QBM/2021/4/3/2691626130194432/2695648258531328/STEM/7f9db3f1-7bf1-44d6-9a77-6f5240842586.png)
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