已知:矩形ABCD中,对角线AC与BD交于点O,CE平分
,交AB于点E,
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/989ccdf1ea25cba198385429d9597c1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/716fa9adedf4cb803c084177ac47e5bc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a81ac520c49427e2ea19f78b1f7fd309.png)
![](https://img.xkw.com/dksih/QBM/2020/4/20/2445758506115072/2446138683146241/STEM/aa88ea5d3806458199b315ee8394523f.png?resizew=169)
19-20八年级下·山东菏泽·阶段练习 查看更多[3]
山东省菏泽市单县启智学校2019-2020学年八年级下学期4月阶段检测试数学试题河南省洛阳市栾川县2018-2019学年八年级下学期期末数学试题(已下线)专题9.15 矩形(培优篇)(专项练习)-2022-2023学年八年级数学下册基础知识专项讲练(苏科版)
更新时间:2020-04-21 10:24:48
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【推荐1】已知∠BAC的平分线与BC的垂直平分线DG相交于点D,DE⊥AB,DF⊥AC,垂足分别为E、F,
(1)连接CD、BD,求证:△CDF≌△BDE;
(2)若AE=5,AC=3,求BE的长.
(1)连接CD、BD,求证:△CDF≌△BDE;
(2)若AE=5,AC=3,求BE的长.
![](https://img.xkw.com/dksih/QBM/2020/1/5/2370304709361664/2371483958173696/STEM/37143de711334317b6856b19bc5342ca.png?resizew=176)
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【推荐2】如图,△ABC中, BE平分∠ABC交AC边于点E,过点E作DE∥BC交AB于点D,
(1)求证:△BDE为等腰三角形;
(2)若点D为AB中点,AB=6,求线段BC的长;
(3)在(2)条件下,若∠BAC=60°,动点P从点B出发,以每秒1个单位的速度沿射线BC运动,当△PBE为等腰三角形时t的值(请直接写出).
![](https://img.xkw.com/dksih/QBM/2017/7/7/1725125875449856/1726705358102528/STEM/c43536a717354453be9fc233a90e129e.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2017/7/7/1725125875449856/1726705358102528/STEM/b751f0e54885491694f6d6893b8c9289.png?resizew=188)
(1)求证:△BDE为等腰三角形;
(2)若点D为AB中点,AB=6,求线段BC的长;
(3)在(2)条件下,若∠BAC=60°,动点P从点B出发,以每秒1个单位的速度沿射线BC运动,当△PBE为等腰三角形时t的值(请直接写出).
![](https://img.xkw.com/dksih/QBM/2017/7/7/1725125875449856/1726705358102528/STEM/c43536a717354453be9fc233a90e129e.png?resizew=158)
![](https://img.xkw.com/dksih/QBM/2017/7/7/1725125875449856/1726705358102528/STEM/b751f0e54885491694f6d6893b8c9289.png?resizew=188)
![](https://img.xkw.com/dksih/QBM/2017/7/7/1725125875449856/1726705358102528/STEM/54d49424f516413f9855a1e78e688948.png?resizew=207)
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【推荐1】已知在
和
中,
,
,
,
,
相交于点
,连接
.
(1)求证:
;
(2)求证:
;
(3)求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c105d6ba18fbb0581fb982175e2eac9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ac3d3b55561ec5d4acc242ecd1c7f41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a608fe3ad751ed330e27bfac7800a288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/212125c9527ce3c18db6ca7d05902d23.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8290323a3da9d76a509ba5d14daabe97.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b2f9c3b578fc0598d5ec6c79404c6cc2.png)
![](https://img.xkw.com/dksih/QBM/2021/2/25/2665791810478080/2672889993871360/STEM/a1bd63a2-2f88-49fa-90b6-fce815c4d14d.png?resizew=261)
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解题方法
【推荐2】如图,在
中,点D在边
上,
.将
沿
对折得到
,
交
于点F.
(1)如图①,若
,
,求
的度数;
(2)如图②,若
,请说明
;
(3)若
,将
绕点B逆时针方向旋转一个角度
,记旋转中的
为
.在旋转过程中,直线
分别与直线
、直线
交于点M、点N,是否存在这样的点M、点N,使
与
相等?若存在,请直接写出旋转角
的度数;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(1)如图①,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68e744f480e11f588570c5d6738799f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36719f1e764ee0e719b65c49fae84677.png)
(2)如图②,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b529a0526c6f5ae155605d4a2880e0b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c5840e0454fdec7d2158072c43b8db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22629ec917eed7acbc571d4f25a94a4b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07fbad473c16df3ff62c1c6b37de6aa8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0bbc4bb12c8c63a205e60ed2335be1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f23c76692342e0cf0e026b7b9c9432.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/e7098c45594103b46e6b57cfc6023e93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5567eab2f0af611b817cd26a56796cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2021/7/1/2755076744830976/2757787500863488/STEM/7918c415-abdb-4410-88f3-e238cdbc2838.png)
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解答题-问答题
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(0.4)
【推荐1】如图,已知矩形
中,
,
,点O是
边的中点,点E是矩形内一个动点,且
.
时,连接
、
,直接写出
的度数;
(2)当
时,连接
,若
,求
的长;
(3)当
时,将线段
绕点D逆时针旋转
后,得到线段
,点P是线段
的中点,当点E在矩形
内部运动时,求点P运动路径的长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c852c0f14e6a4b59e8f6c4957b0a7629.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef0402dd5ae3db10281f9f1e11738bcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2fc28f622892dd18bbbac95d541acfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/890c4bcc71c6ba24301e364c29a6a05a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6282292819434a8905a212427613fd85.png)
(2)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f8120119749d4bc28067e73fca7d46cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a04081cb23be32fd60e70f5054652531.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(3)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e258ab9e600435b37465092243d99f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,矩形
的边
、
分别在
轴和
轴上,顶点B在第一象限,点D在
的延长线上,已知
,且
.把
沿矩形
的对角线
翻折后,顶点A恰好落在线段
的中点
处.
(1)求
的度数;
(2)求线段
,
的长度;
(3)已知点P是直线
上的一个动点,在这个坐标平面内是否存在点Q,使得以O、A、P、Q为顶点的四边形是菱形?若存在,请直接写出所有符合条件的点
的坐标;若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98c78f77e5b86ccd537e5f027de9ffe2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e84a892652ac5b8d666585e8ac49354.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7c314398e26ffc7164b82946eeb4273.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/14/504e2349-9915-4a53-aff2-b464c80792a5.jpg?resizew=168)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
(2)求线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/683c590673eece14fea3319c4fd5eb55.png)
(3)已知点P是直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
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