将矩形ABCD绕点B顺时针旋转得到矩形A1BC1D1,点A、C、D的对应点分别为A1、C1、D1
(1)当点A1落在AC上时
①如图1,若∠CAB=60°,求证:四边形ABD1C为平行四边形;
②如图2,AD1交CB于点O.若∠CAB≠60°,求证:DO=AO;
(2)如图3,当A1D1过点C时.若BC=5,CD=3,直接写出A1A的长.
(1)当点A1落在AC上时
①如图1,若∠CAB=60°,求证:四边形ABD1C为平行四边形;
②如图2,AD1交CB于点O.若∠CAB≠60°,求证:DO=AO;
(2)如图3,当A1D1过点C时.若BC=5,CD=3,直接写出A1A的长.
![](https://img.xkw.com/dksih/QBM/2019/4/19/2185763445153792/2188092826673152/STEM/13a6a2b9a96b44ca872344903f3c3044.png?resizew=489)
2019·四川成都·一模 查看更多[7]
四川省成都市族锦中学2019届九年级中考一模数学试题【区级联考】广东省广州市天河区2019届九年级第一次诊断性检测数学试题【市级联考】江西省宜春市2019届九年级中考适应性考试数学试题(一)福建省南平市第九中学2018-2019学年八年级下学期期末数学试题成都市温江中学2018-2019学年八年级下期末数学培优、能力提升卷广东省东莞市谢岗四中2018-2019学年八年级下学期期末考试数学试题(已下线)专题18.2 (特殊)的平行四边形中的翻折、旋转与动态问题 专题讲练-2022-2023学年八年级数学下册重难题型全归纳及技巧提升专项精练(人教版)
更新时间:2019-04-22 20:29:09
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解答题-证明题
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【推荐1】综合与探究
如图,在平面直角坐标系中,点
的坐标分别为
和
,且
满足
.将矩形
沿对角线
所在的直线折叠,点B落在点D处,
与y轴相交于点E.
(1)
___________,
___________;
(2)试证明
≌
,并直接写出点E的坐标;
(3)若点F是线段
上的一个动点,则
的最小值为___________;
(4)平面内是否存在点M与点N使四边形
为正方形?若存在,请直接写出点M的坐标;若不存在,请说明理由.
如图,在平面直角坐标系中,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62e478787ebfeb68a5a7594dbd9eecd4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4a90cfdbfa05577b6ec0b22739e7c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fabe33b24e9cabf7a5530bc75d37da2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62ff2912fd8d93b6e692936d95b727c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8304a3abd0c3bff2e9bff7c4093ae8b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/0d696154-5ec1-4234-81ce-3096bd986f05.png?resizew=164)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/380bbacf854e30e2e747fc286d2b9997.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ccd4162c7d09f970cb77cadacdbe521.png)
(2)试证明
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e72a855bb6d80737099e412ed52a26b.png)
(3)若点F是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a32e98967ce1cd545e9cf4eb877cbba.png)
(4)平面内是否存在点M与点N使四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad2de15162b13ba943f8da2498580cf9.png)
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【推荐2】在菱形
中,点
、
分别为
、
边上的点,连接
、
、
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/30563a0a-f0b7-49b8-82a6-00d452ee828b.png?resizew=537)
(1)如图1,
与
交于点
,若
,
,
,求
的长;
(2)如图2,若
,
,求证:
;
(3)如图3,在(2)的条件下,将
沿
翻折至同一平面内,得到
,连接
与
交于点
,记
、
、
的面积分别为
、
、
,当
为
中点时,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/20/30563a0a-f0b7-49b8-82a6-00d452ee828b.png?resizew=537)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac679f877d3e3b3acef1f1f8e3654b4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6a028fd5b281ef168702a803baca6e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fefeb8eabff97b4bbcba5bc47ed029fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f805768a5ffaf8bdfa4bc3b680aafdc9.png)
(3)如图3,在(2)的条件下,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e631c5910ab811b51bbbc36f1680ce8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84f0ae0d8e74c9ca1708ce83c36c94df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ff39c7aa648afd1080206c8080ff79e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd5e09b05a9f116c0aaa1e19d50969c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c113a120ee8e64fd0067402c9543534d.png)
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【推荐1】如图1,在平行四边形
中,
,
于
,
于
,交
于
.
;
②若
,
,求
的长;
(2)如图2,若
,求
的值;
(3)如图3,平行四边形
外部有一
点,连接
、
,满足
,
,请直接 写出
、
和
三者的数量关系.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98de02d1d5b7ac04bce54be393218922.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e3f5dc11efe60b4fd9a13b1d6b83842.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f4eb640505099730001c4cbe65c3cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6812d6baba3b0e9f33dae7e8028d8595.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afb04497a6cfe70c39c578b81e8dca33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(2)如图2,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51614ef7419fe2a38e1c002cfe609119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6834a7057cae9dc0036a5c5bb934606.png)
(3)如图3,平行四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44d6321e6de60f4e62964c83759def91.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf83bba5ad0d99db8ef99f01c4dbe495.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/826c728050e3378921442ace20269ef6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
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【推荐2】如图, 在Rt
ABC 中AB=10,BC⊥AC,P为线段AC上一点,点Q,P 关于直线BC对称,QD⊥AB于点D,DQ与BC交于点 E,连结DP, 设AP=m.
(1) 若BC=8,求AC的长,并用含m的代数式表示PQ的长;
(2)在(1)的条件下,若AP=PD.求CP的长:
(3)连结PE, 若∠A=60°,
PCE与
PDE的画积之比为1:2,求m的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1) 若BC=8,求AC的长,并用含m的代数式表示PQ的长;
(2)在(1)的条件下,若AP=PD.求CP的长:
(3)连结PE, 若∠A=60°,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/2021/11/19/2854656373923840/2856267821301760/STEM/3a85911f-af91-4483-96d0-6be4b6a626b7.png)
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【推荐1】已知,
是
的中线,过点C作
.
(1)如图1,
交
于点F,连接
.求证:四边形
是平行四边形;
(2)P是线段
上一点(不与点A,D重合),
交
于点F,交
于点E,连接
.
①如图2,四边形
是平行四边形吗?请说明理由.
②如图3,延长
交
于点Q,若
,
,
,请直接写出
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60f11e9afb1c3b15f364f2c95ca3a41d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/4994f262-c254-4051-9f6d-c4527a0e66a2.png?resizew=411)
(1)如图1,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64b8f1e9bd4cd5f311e5671500011344.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad3a079cfdcca9acdacecbf08f9f78cc.png)
(2)P是线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b211f48325d52849e17efdab69dd5e3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
①如图2,四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1195c8aeabf1925d6980b8de505e4050.png)
②如图3,延长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d3c22f88e400d765d6b0606cf422432f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b27e47690ed332c573186992b6d25654.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53778c954f9225b3ea846b7e0514537a.png)
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真题
【推荐2】如图,在
中,
,以
为直径的
交
于点
,
,垂足为
的延长线交
于点
.
的值;
(2)求证:
;
(3)求证:
与
互相平分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/40975f7553d8cfa57951b568bae9c464.png)
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99ff0a5901c896b54e958d34e0d63f0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5c45d2477e4eacc270021b8f0d13af0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6f9353ca110c8b81561455b232dbc15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/df6b7c7c1d965c73d28f50ce02144d84.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9cdc8620d051021abe1b4d92d460735f.png)
(3)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐1】综合与探究
问题情境:
如图,在矩形
中,点
为边
上的动点,点
为边
上的动点,点
为边
上的动点,连接
,过点
作
于点
,交边
于点
.探究线段
与
的比值是否发生变化.
特例探究:
(1)如图2,当点
与点A重合,点
与点
重合,发现
.请证明;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/7a317810-670c-436b-8110-84211c7ff8ac.png?resizew=178)
探究发现:
(2)如图1,探究
成立吗?若成立,请证明;若不成立,请写出你的发现,并说明理由;
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/73c08549-17d4-4bd6-be6e-c30c4fac29fa.png?resizew=156)
探究拓展:
(3)如图3,把“矩形
”改为“四边形
,
,
,
,点
与点
重合,点
与点
重合”,其余条件不变,猜想
的值,并证明.
问题情境:
如图,在矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.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/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/851b5e53821ac0601c61a1dd694b3904.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7c57b07f75e97d9f84718bd495ebcf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
特例探究:
(1)如图2,当点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b1a0ee6a2fa0e57f18ff6cbbc84f65d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/7a317810-670c-436b-8110-84211c7ff8ac.png?resizew=178)
探究发现:
(2)如图1,探究
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e4811b31918c6eef61419dcd009814c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/73c08549-17d4-4bd6-be6e-c30c4fac29fa.png?resizew=156)
探究拓展:
(3)如图3,把“矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a16dc02090b6e9263555061f14fbc8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00ec435aa1401dbce7863b531bf2f3e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4795ee1f96b430529934e2231b38885d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36dccada6589869b557e08cf5a648006.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/14/bc690be3-7abd-4ac3-b77c-01d4f329b0d8.png?resizew=164)
您最近一年使用:0次
解答题-证明题
|
较难
(0.4)
名校
【推荐2】如图,P 为矩形
的边
上一动点,
,将
绕点B顺时针旋转
得到
(点 P 的对应点为点
)连接
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/67e05d77-8588-449d-bd10-ec068a05c92a.png?resizew=144)
(1)求证:
;
(2)连接
,若
,求
的值.
![](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/151f7aef7d0f56e18562f5a4030cf815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a855335176fc36a15017f50a8561348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4876a481106f5d4909377275961b89f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86076e60d1727a012a0eab695dd6914f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21037e170bdbb322558e79c40c00b454.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/31/67e05d77-8588-449d-bd10-ec068a05c92a.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62f9a3935cd124d021c7b18b0f634915.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/599dac5b2243ebb2433592b9475cda28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b8e4da6c2580490e4e8d6465f4c3112.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2af7bd9a49f355fa1cddd43af0ccfab.png)
您最近一年使用:0次