如图,点C在线段AB上,分别以AC、BC为边在线段AB的同侧作正方形ACFG和正方形BCDE,连接GE,点M是GE的中点,连接MD、MF.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/cb526a66-bc0d-46dd-b9bc-48acb32ccc00.png?resizew=504)
(1)尝试探究:
结论1:MD、MF的数量关系是______;
结论2:MD、MF的位置关系是______;
(2)将图1中的正方形BCDE绕点C按顺时针方向旋转.
①如图2,当点B恰好落在边FC的延长线上,连接GE,点M是GE的中点,连接MD,MF,请问(1)中的两个结论是否成立?若成立,请写出证明过程;若不成立,请说明理由;
②若AC=2
,BC=2,在旋转过程中,当D,E,F三点在一条直线上时,请直接写出ME的长.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/10/cb526a66-bc0d-46dd-b9bc-48acb32ccc00.png?resizew=504)
(1)尝试探究:
结论1:MD、MF的数量关系是______;
结论2:MD、MF的位置关系是______;
(2)将图1中的正方形BCDE绕点C按顺时针方向旋转.
①如图2,当点B恰好落在边FC的延长线上,连接GE,点M是GE的中点,连接MD,MF,请问(1)中的两个结论是否成立?若成立,请写出证明过程;若不成立,请说明理由;
②若AC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4056761b8f826eeb6ad8c9a151d3c9c.png)
21-22八年级下·江苏·期末 查看更多[4]
江苏省连云港市灌南县、赣榆区2021-2022学年八年级下学期期末数学试题江苏省连云港市灌南县2021-2022学年八年级下学期期末数学试题(已下线)九年级数学上学期开学摸底考试卷(苏科版)-2022-2023学年九年级数学考试满分全攻略(苏科版)(已下线)期末难点特训(五)和特殊四边形有关的压轴大题-【微专题】2022-2023学年八年级数学下册常考点微专题提分精练(苏科版)
更新时间:2022-08-06 19:10:28
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相似题推荐
解答题-作图题
|
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(0.4)
【推荐1】已知:正方形
,点
是边
(或
的延长线)上任意一点,
平分
,交射线
于点
.
(1)如图1,若点
在线段
上.
①依题意补全图1;
②用等式表示线段
,
,
之间的数量关系,并证明;
(2)如图2,若点
在线段
的延长线上,请补全图2并直接写出线段
,
,
之间的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f50b3ae183997b707d16eb4e7f6712fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94d2506539ad8760cf7ed366c0c537c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/7/220463d0-aa30-45ea-a540-1ca8c5dd6ae5.png?resizew=399)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
①依题意补全图1;
②用等式表示线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3533837e3d08c461dea031a44e5424d.png)
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【推荐2】在四边形 ABCD 中,E 为 BC 边中点.
(Ⅰ)已知:如图,若 AE 平分∠BAD,∠AED=90°,点 F 为 AD 上一点,AF=AB.求证:(1)△ABE≌AFE;(2)AD=AB+CD
(Ⅱ)已知:如图,若 AE 平分∠BAD,DE 平分∠ADC,∠AED=120°,点 F,G 均为 AD上的点,AF=AB,GD=CD.求证:(1)△GEF 为等边三角形;(2)AD=AB+
BC+CD.
(Ⅰ)已知:如图,若 AE 平分∠BAD,∠AED=90°,点 F 为 AD 上一点,AF=AB.求证:(1)△ABE≌AFE;(2)AD=AB+CD
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/d19aada5-5396-49b8-ba0e-7b5e42aebb1f.png?resizew=124)
(Ⅱ)已知:如图,若 AE 平分∠BAD,DE 平分∠ADC,∠AED=120°,点 F,G 均为 AD上的点,AF=AB,GD=CD.求证:(1)△GEF 为等边三角形;(2)AD=AB+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/19/cc862f22-9ae4-4597-9b37-6016799a8ae9.png?resizew=150)
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【推荐1】问题情境:数学活动课上,老师出示了一个问题:如图1,在正方形ABCD中,点E是边CD上一点,将△ADE以点A为中心,顺时针旋转90°,得到△ABF,连接EF.过点A作AG⊥EF,垂足为G.试猜想FG与GE的数量关系,并证明.
(1)独立思考:请你解决老师所提出的问题;
(2)拓展探究:智慧小组在老师所提问题的基础上,连接DG,他们认为DG平分∠ADC.请你利用图2说明,智慧小组所提出的结论是否正确?请说明理由;
(3)问题解决:在图2中,若AD+DE=28,则四边形AGED的面积为 .(直接写出答案即可)
(1)独立思考:请你解决老师所提出的问题;
(2)拓展探究:智慧小组在老师所提问题的基础上,连接DG,他们认为DG平分∠ADC.请你利用图2说明,智慧小组所提出的结论是否正确?请说明理由;
(3)问题解决:在图2中,若AD+DE=28,则四边形AGED的面积为 .(直接写出答案即可)
![](https://img.xkw.com/dksih/QBM/2021/12/4/2865064141905920/2867229234028544/STEM/2bdbff5e-47ed-4740-8fc6-2cfdaea18c6e.png?resizew=487)
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【推荐2】如图,在
中,对角线
、
相交于点
,点
、
分别为
、
的中点,延长
至
,使
,连接
.
(1)求证:
;
(2)四边形
是平行四边形吗?请说明理由;
(3)若四边形
是矩形,则线段
、
的数量关系是______.
![](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/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/312c446a4790d75afde82f81e0e217ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/9/fb9ecf71-9efe-4f94-a104-eeb9d95f6199.png?resizew=206)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2060b15e0b6d7baa01a021b30f197cec.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34858c5db10ced7c02f17023d9585654.png)
(3)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34858c5db10ced7c02f17023d9585654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-问答题
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解题方法
【推荐1】如图,正方形
的边长为8,
是
的中点,
是边
上的动点,连结
,以点
为圆心,
长为半径作
.
![](https://img.xkw.com/dksih/QBM/2020/11/2/2584235443527680/2585528039538688/STEM/f2a3ced6-ef6c-4a0f-9ec4-6931310156c7.png)
(1)当
长为多少时,
;
(2)当
与正方形
的边相切时,求
的长;
(3)设
的半径为
,请直接写出正方形
中恰好有两个顶点在圆内的
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://img.xkw.com/dksih/QBM/2020/11/2/2584235443527680/2585528039538688/STEM/f2a3ced6-ef6c-4a0f-9ec4-6931310156c7.png)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7934a0145b1e5998633bf5a2763d210.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
(3)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d1d9218917d85a1dc19e60f076b8bfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
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【推荐2】【问题情境】如图,在
中,
,
,
是
边上的高,点
是
上一点,连接
,过点
作
于
,交
于点
.
【特例猜想】如图
,当
时,直接写出
与
之间的数量关系为_____;
【问题探究】如图
,当
时,(1)中的结论是否还成立?若成立,请写出证明过程,若不成立,请指出此时
与
的数量关系,并说明理由;
【类比运用】如图3, 连接
, 若
,
,
,求
的长.
![](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/61cfd2a95ad9cf4d9e236bdaa754f719.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a598a35e6a4bfb3a5f08b55b70bdc3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
【特例猜想】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5095a28bb1b91bf6bed9e2cfbd76bb18.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【问题探究】如图
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04c525393775354325cbf7839366ca50.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【类比运用】如图3, 连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f2f91aa5dea19712561c7905535d15b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a2ab6940dca62be1f3b2b5f8531990.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5eeb94acdc3de00655e6e29d5372da09.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e72b2e1ff83e95df048745322982451.png)
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解答题-证明题
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【推荐1】如图1,在正方形ABCD中,点E、F分别是边BC、CD上的点,且CE=CF,连接AE,AF,取AE的中点M,EF的中点N,连接BM,MN.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418091673968640/2418897509654528/STEM/be14cf520b384b18855766e7dffb4e4b.png?resizew=315)
(1)请判断线段BM与MN的数量关系和位置关系,并予以证明.
(2)如图2,若点E在CB的延长线上,点F在CD的延长线上,其他条件不变,(1)中的结论是否仍然成立?若成立,请给出证明;若不成立,请说明理由.
![](https://img.xkw.com/dksih/QBM/2020/3/12/2418091673968640/2418897509654528/STEM/be14cf520b384b18855766e7dffb4e4b.png?resizew=315)
(1)请判断线段BM与MN的数量关系和位置关系,并予以证明.
(2)如图2,若点E在CB的延长线上,点F在CD的延长线上,其他条件不变,(1)中的结论是否仍然成立?若成立,请给出证明;若不成立,请说明理由.
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【推荐2】正方形
边
上有一动点
(不与端点
、
重合),连接
,
为
上一点,连接
.
(1)如图1,连接
,若
,求
的度数;
(2)如图2,连接
,若
,作
于点
,延长
交
于点
,求证:
;
(3)如图3,在(2)的条件下,连接
,
,点
运动过程中,当
取最小值时,直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.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/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/14/6984acfa-b94c-44ea-af18-a02d4af089bb.png?resizew=107)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/14/90c9a382-94fb-40e6-b741-8e6d054237c4.png?resizew=101)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/14/323e18f5-bbeb-4206-82b6-b60b333d2963.png?resizew=107)
(1)如图1,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c7e48723871f06a6aeae31a2a1ff79d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/024015816ece1fd176186ed0f04db8f9.png)
(2)如图2,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7cc087c22e1fc1197236c71e5465d33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff68b481fdf58ab09bae9fdd7715be2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06e322e0c87479bba874db9ae9ba36b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ef5e79f540e011d793ed332bd02dce4.png)
(3)如图3,在(2)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6655e2fa64a32cd12fe0279afd65d73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f3c60d2a3ae1eac21034fc4ed7b725a.png)
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