已知四边形ABCD中,
,
,连接AC,BD交于点E,过点A作
交BD于点F,连接CF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/c3540c0e-44fa-49d8-9a68-8771486010b2.png?resizew=384)
(1)如图1,求证:四边形ABCF为菱形;
(2)如图2,若
,在不添加任何辅助线的情况下,请直接写出图2中的四个等腰三角形(等边三角形除外).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b6e08fde74010412a6f14ad4dfbcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd95dc30c0344788b94289c464a3158e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6095bae4840bfa80f2468f94b2002d7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/c3540c0e-44fa-49d8-9a68-8771486010b2.png?resizew=384)
(1)如图1,求证:四边形ABCF为菱形;
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03366e8ad89bbf52a24243e94646fc7.png)
更新时间:2022-06-11 15:26:08
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相似题推荐
解答题-问答题
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【推荐1】如图,已知直线y=2x+b交x轴于点A(﹣2,0),交y轴于点B,直线y=2交AB于点C,交y轴于点D,P是直线y=2上一动点,设P(m,2).
(1)求直线AB的解析式和点B,点C的坐标;
(2)直接写出m为何值时,△ABP是等腰三角形;
(3)求△ABP的面积(用含m的代数式表示).
(1)求直线AB的解析式和点B,点C的坐标;
(2)直接写出m为何值时,△ABP是等腰三角形;
(3)求△ABP的面积(用含m的代数式表示).
![](https://img.xkw.com/dksih/QBM/2019/12/9/2351238899064832/2351631027298304/STEM/2a28ce17afff45d4b8e1452ffc161c0d.png?resizew=231)
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解答题-作图题
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适中
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【推荐2】如图,已知
.
(1)利用直尺和圆规,根据下列要求作图(保留作图痕迹,不要求写作法).
①作
的平分线
交
于点
;
②作线段
的垂直平分线交
于点
,交
于点
.
(2)在所作的图中,连接
、
.写出图中所有的等腰三角形:___________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/25/cd03e6ff-cc97-4965-aa6b-8dfbe86c224d.png?resizew=153)
(1)利用直尺和圆规,根据下列要求作图(保留作图痕迹,不要求写作法).
①作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
②作线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)在所作的图中,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
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解答题-作图题
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解题方法
【推荐3】【定义】如果1条线段将一个三角形分成2个等腰三角形,那么这1条线段就称为这个三角形的“好线”,如果2条线段将一个三角形分成3个等腰三角形,那么这2条线段就称为这个三角形的“好好线”.
【理解】如图①,在△ABC中,∠A=27°,∠C=72°,请你在这个三角形中画出它的“好线”,并标出等腰三角形顶角的度数.
如图②,已知△ABC是一个顶角为45°的等腰三角形,请你在这个三角形中画出它的“好好线”,并标出所分得的等腰三角形底角的度数.
【应用】
(1)在△ABC中,已知一个内角为24°,若它只有“好线”,请你写出这个三角形最大内角的所有可能值 (按从小到大写);
(2)在△ABC中,∠C=27°,AD和 DE分别是△ABC的“好好线”,点D在BC边上,点E在AB边上,且AD=DC,BE=DE,根据题意写出∠B的度数的所有可能值 .
【理解】如图①,在△ABC中,∠A=27°,∠C=72°,请你在这个三角形中画出它的“好线”,并标出等腰三角形顶角的度数.
如图②,已知△ABC是一个顶角为45°的等腰三角形,请你在这个三角形中画出它的“好好线”,并标出所分得的等腰三角形底角的度数.
【应用】
(1)在△ABC中,已知一个内角为24°,若它只有“好线”,请你写出这个三角形最大内角的所有可能值 (按从小到大写);
(2)在△ABC中,∠C=27°,AD和 DE分别是△ABC的“好好线”,点D在BC边上,点E在AB边上,且AD=DC,BE=DE,根据题意写出∠B的度数的所有可能值 .
![](https://img.xkw.com/dksih/QBM/2020/11/4/2585798034096128/2590498512076800/STEM/6f8908e4-2491-425d-8ad9-0f033ae17065.png)
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名校
【推荐1】如图,正方形
的边长是
,点
,
,
,
分别从点
,
,
,
出发,以
的速度同时向点
,
,
,
运动.在运动的过程中,四边形
是何种四边形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb26c5cdef6f16f4b39cd091041b439.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/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d989a128e30a701dfff5592476a76bab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/9/440a0ab9-86d2-40a5-b408-46e2a874f8ea.png?resizew=150)
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解答题-证明题
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【推荐2】如图,在平行四边形
中,将平行四边形折叠,使点
落在
边上的点
处,折痕为
,连接
、
、
,
与
交于点
,连接
.
![](https://img.xkw.com/dksih/QBM/2022/4/11/2960674477105152/2986864357670912/STEM/1f5da7a8-bb14-4936-a11c-ce6affb16378.png?resizew=297)
(1)求证:四边形
是菱形.
(2)若
,
,
,求
的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://img.xkw.com/dksih/QBM/2022/4/11/2960674477105152/2986864357670912/STEM/1f5da7a8-bb14-4936-a11c-ce6affb16378.png?resizew=297)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ec07464a1b5bc7a2cc338b1a13e0f4a6.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b03bb56c7e76954b192bd8595a0865a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
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