如图,点
,
,分别是正方形
的边
,
的中点,
与
交于点
,连接
.
(1)写出线段
与
的数量关系和位置关系,并证明;
(2)求
的度数.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bcdae78f4d3b8d8213ac3ac9a9567eb5.png)
(1)写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84c38ffc474f45993a7ed1e3cd5da75a.png)
![](https://img.xkw.com/dksih/QBM/2021/5/12/2719569470930944/2793230648401920/STEM/662a6c1e-ed10-40e9-a9d8-b0fa6c3318b3.png)
更新时间:2021-08-24 19:45:12
|
相似题推荐
解答题-问答题
|
较难
(0.4)
【推荐1】【教材呈现】
(1)如图1,在正方形
中,E是
上的一点,
经过旋转后得到
,①旋转中心是点 ;旋转角度最少是 度.
②爱动脑筋的小明,在
边上取点G使得
,他发现:
,他的发现正确吗?请你判断并说明理由.
【结论应用】
(2)①图1中,若正方形
的边长为a,则
的周长为 (用含有a的式子表示)
②如图2,在四边形
中
,E是
上一点,且
,则
的长= .
【类比迁移】
(3)如图3,在菱形
中,
, 求
的长.
(1)如图1,在正方形
![](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/e742966e3711cfa53dce04022acf4bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
②爱动脑筋的小明,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851b6466fc810946d7f12926e35000d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0638ba7cde29c89dbc8f8313ef4c044d.png)
【结论应用】
(2)①图1中,若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3f3197779e26c71a1b633b279613969.png)
②如图2,在四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3270d98cb6ae97526de9107cd86799e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5ac52e41003696f6752d500703f236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
【类比迁移】
(3)如图3,在菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14d653c48b76dcb135a43f086273f34e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/4/6942b58f-5404-4431-912f-d8da34ed1bc8.png?resizew=405)
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解答题-证明题
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【推荐2】如图,在
中,
,点
是
边上一动点,连接
.将
绕点
逆时针旋转,得到
,满足
,并连接
.
(1)如图1,求证:
;
(2)连接
为
中点,
为
中点,连接
交
于
.
①猜想
的度数,并证明当
时(如图2)你猜想的结论;
②连接
,若
,直接写出
长的最小值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d54cb14e377e3474e97365fc0e15f8.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/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43651721f6c0ea4cf50a33054ecc5d60.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/1/02cb305d-3d8b-4cb7-a666-bf4f839ecbb6.png?resizew=301)
(1)如图1,求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/421291381be28da4bd16560fd383b4a9.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac33ae73e6a421ed8c63eaa043b61d81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
①猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb988f119452dab8fe802eb27bfb903d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
②连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44090aeb408607f53dd26505e5ef2f63.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
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【推荐1】如图,在
中,
,
,
是
边上的中线,点E,F分别在
,
边上运动(点E不与点A,C重合),且保持
,连接
,
,
.
;
(2)求四边形
的面积;
(3)请直接写出三条线段
,
,
之间的数量的关系:_______.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08313da7b66283d2e0b3987f3e6761f4.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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b91f064bb73019053992fe781a53356a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e5059125c0f1864fdf604761967a712.png)
(2)求四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
(3)请直接写出三条线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
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【推荐2】如图所示,在
中,
,
,
,点
从点
出发沿
方向以
的速度向点
匀速运动,同时点
从点
出发沿
方向以
的速度向点
匀速运动,当其中一个点到达终点时,另一个点也随之停止运动,设点
运动的时间是
秒(
).过点
作
于点
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/7addbccb-696a-497c-9201-2cbfd3ff12b1.png?resizew=183)
(1)求证:四边形
是平行四边形;
(2)四边形
能够成为菱形吗?如果能,求出相应的
值;如果不能,请说明理由;
(3)当
为何值时,
为直角三角形?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfa8cee7d2463f6f7d352e8b65f47cf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77bbc10a579eaacd186e0ed02e059263.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/970bfbc86366f26152afa12012bf2b54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/357d20998ac4e85bb0a13ecd8d0562fa.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/9abaeba15f3abdd877bc701af52c5cd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0158a0fbbf93db77c4a8afa95aa10f55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2f9a9781bcf32e907bdd3170261648a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3a51949f48ee8cf746851ba779b078e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6b1a96433f4a8a8d1603db4dcc00703.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d276d0010fd458383ea3dd61415e1aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c700aba9c6abc4f9e93fbc268929b9a8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/7addbccb-696a-497c-9201-2cbfd3ff12b1.png?resizew=183)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
(2)四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/946c16d99496d31ce4d87301a4793393.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36a1b09c653185842513e24ebba60bb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3634979dfcebf857b20874dd320d80b3.png)
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解答题-问答题
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【推荐3】(1)问题发现:如图1,△ABC与△CDE均为等腰直角三角形,∠ACB=∠DCE=90°,则线段AE、BD的数量关系式为_____,AE、BD所在直线的位置关系为_____.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/0b44c08f-200d-4537-94ed-6e32e414dbaa.png?resizew=198)
(2)深入探究:如图2,在(1)的条件下,若点A、E、D在同一直线上,CM为△CDE中DE边上的高,则∠ADB的度数为_____,线段CM、AD、BD之间的数量关系式为______.请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/f2ff6b34-d5c4-4c7d-a711-ab9ddb7de353.png?resizew=212)
(3)解决问题:如图3,已知△ABC中,AB=7,BC=3,∠ABC=45°,以AC为直角边作等腰直角△ACD,∠CAD=90°,AC=AD,连接BD,则BD的长为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/0b44c08f-200d-4537-94ed-6e32e414dbaa.png?resizew=198)
(2)深入探究:如图2,在(1)的条件下,若点A、E、D在同一直线上,CM为△CDE中DE边上的高,则∠ADB的度数为_____,线段CM、AD、BD之间的数量关系式为______.请说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/f2ff6b34-d5c4-4c7d-a711-ab9ddb7de353.png?resizew=212)
(3)解决问题:如图3,已知△ABC中,AB=7,BC=3,∠ABC=45°,以AC为直角边作等腰直角△ACD,∠CAD=90°,AC=AD,连接BD,则BD的长为______.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/18/a3fbd895-c24a-46de-906c-a1dd40a5708d.png?resizew=111)
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【推荐1】如图,已知四边形ABCD是正方形,P是BC上的一点,DE⊥AP于E,BF⊥AP于F.求证:DE=EF+FB.
![](https://img.xkw.com/dksih/QBM/2019/3/6/2154591518793728/2161035453161472/STEM/3b568d04c1e740e4a7447188dbf20445.png?resizew=175)
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名校
【推荐2】如图,已知在正方形
中,
,点
是边
上一点(不与点
、
重合),连接
交
于点
,延长
交
的外角角平分线于点
,连接
.
时,求
的面积;
(2)求证:
;
(3)连接
,当
时,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/727ad3e630a224303d6d3b8ad5c114ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da8046ae7d118efabe9e2fbadcfe92d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/441dec590b47adc3678a291a3ec89a4a.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3767efa8adfb71001ad39df9560cbf6a.png)
(3)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22facbd7894b1dcaf6a985e99f33f025.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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