如图,在平行四边形ABCD中,AE⊥BC于E,点F在BC延长线上,且CF=BE,连接AC,DF,
(1)求证:四边形AEFD是矩形;
(2)若∠ACD=90°,CF=3,DF=4,求AD的长度.
(1)求证:四边形AEFD是矩形;
(2)若∠ACD=90°,CF=3,DF=4,求AD的长度.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/16/b0256ba8-b272-445a-9021-cce520fe6aa5.png?resizew=149)
更新时间:2020-04-23 08:41:22
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解答题-证明题
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适中
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【推荐1】如图,等腰△ABC中,已知AC=BC=
,AB=2,作∠ACB的外角平分线CF,点E从点B沿着射线BA以每秒1个单位的速度运动,过点E作BC的平行线交CF于点F.
(1)求证:四边形BCFE是平行四边形;
(2)当点E是边AB的中点时,连接AF,试判断四边形AECF的形状,并说明理由;
(3)设运动时间为t秒,是否存在t的值,使得以△EFC的其中两边为邻边所构造的平行四边形恰好是菱形?不存在的,试说明理由;存在的,请直接写出t的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
(1)求证:四边形BCFE是平行四边形;
(2)当点E是边AB的中点时,连接AF,试判断四边形AECF的形状,并说明理由;
(3)设运动时间为t秒,是否存在t的值,使得以△EFC的其中两边为邻边所构造的平行四边形恰好是菱形?不存在的,试说明理由;存在的,请直接写出t的值.
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【推荐2】如图,在平行四边形
中,
为
的中点,
过点
,分别交
,
的延长线于点
、
.
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726352245579776/2780389043322880/STEM/bc125e82-94b6-4fe3-9001-c677cdec4e5d.png)
(1)求证:
;
(2)求证:四边形
是平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dea2ae9d515f9ab351ad72306b776ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2021/5/22/2726352245579776/2780389043322880/STEM/bc125e82-94b6-4fe3-9001-c677cdec4e5d.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8ce1475f537b4ad21775bfaa16daa0c.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c87e1fe20bb0e8292e993657e14bc79a.png)
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解答题-证明题
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适中
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【推荐1】如图,在Rt△ABC中,∠C=90°,O是斜边AB上的中点,AE=CE,BF∥AC.
![](https://img.xkw.com/dksih/QBM/2013/5/27/1573657699434496/1573657705209856/STEM/47539fa37bbf4741a91d68a960c761d8.png)
(1)求证:△AOE≌△BOF;
(2)求证:四边形BCEF是矩形.
![](https://img.xkw.com/dksih/QBM/2013/5/27/1573657699434496/1573657705209856/STEM/47539fa37bbf4741a91d68a960c761d8.png)
(1)求证:△AOE≌△BOF;
(2)求证:四边形BCEF是矩形.
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解答题-证明题
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【推荐2】如图1,已知
和
中,
,点D在
边上,点E在
延长线上,将
从此位置开始绕C点顺时针旋转,旋转角是
.操作发现:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/c034d0f2-bffe-4512-98ef-0c675c6e9c54.png?resizew=725)
(1)如图2,当旋转角
时,连接
.求证:四边形
是平行四边形;
(2)如图3,当
时,连接
,直接写出线段
与
的关系为_____________;
(3)解决问题:如图4,当
时,连接
,点F,G,H分别是线段
的中点,连接
.求证:①
是等腰直角三角形;②当旋转角
时,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a6009d5818d85413bf858b2c8cf074b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a0acc93490a6a784eb62201d93dd93d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05df5a26c2b978503e93efa040b99508.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/c034d0f2-bffe-4512-98ef-0c675c6e9c54.png?resizew=725)
(1)如图2,当旋转角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c69a23d106fd34aa17b22e9c9a8de36.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9beeedb7ddaac2cd3d37151d058ab7fb.png)
(2)如图3,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/708d48b595c17d4dccf9b4086d7e664e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e8d80f6159c7b21b9238a0696a0da4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(3)解决问题:如图4,当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13b5ea2fc43b19ca043581eb94197234.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59f3f9f4edf520ce61c8e83a2be394d6.png)
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解答题-证明题
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适中
(0.65)
【推荐1】如图,线段
是
的直径,延长
至点
,使
,点
是线段
的中点,
交
于点
,连接
.
是
的切线;
(2)点
是
上一动点
不与点
,
重合
,连接
,
,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
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适中
(0.65)
【推荐2】
和
是两个全等的等腰直角三角形,
,
的顶点E与
的斜边
的中点重合,将
绕点E旋转,旋转过程中,线段
与线段
相交于点P,线段
与射线
相交于点Q.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/fc25dbda-1674-4386-a23a-df54c1c241cd.png?resizew=142)
(1)如图,当点Q在线段
的延长线上时,求证:
;
(2)在(1)的条件下,
,则
的长为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65633001f2eecfee015749ffb6fa4d1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72cb97395ebc5ee1b212afb7a97b985c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/21/fc25dbda-1674-4386-a23a-df54c1c241cd.png?resizew=142)
(1)如图,当点Q在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a6049d3bbe041ce6779c32d81d25e5f.png)
(2)在(1)的条件下,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57c84d754bc685b73ccb6f2cca83d8ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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