如图,平行四边形
中,
平分
,
,延长
与
交于点P,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/8ee709e1-b087-4396-94f3-c8867b649d01.png?resizew=129)
(1)求证:
;
(2)判断四边形
的形状,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49c8dbc31b2e14067ef2f34b4e25f114.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2c3d2cba96f6f03520c0b3f6e4da03e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2cdba1337ec85fa9722cb4b320a82ae6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/15/8ee709e1-b087-4396-94f3-c8867b649d01.png?resizew=129)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899c3e832543324201dbe63b563295ed.png)
(2)判断四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76981622e3684aca12435743b6a08a8c.png)
22-23九年级下·四川成都·开学考试 查看更多[5]
四川省成都市简阳市2022-2023学年九年级下学期开学学业质量检测数学试题四川省成都市简阳市2022-2023学年九年级上学期期末数学试题(已下线)第十八章《平行四边形》同步单元基础与培优高分必刷卷-2022-2023学年八年级数学下册《考点·题型·技巧》精讲与精练高分突破系列(人教版)安徽省芜湖市部分学校2022-2023学年八年级下学期第三次月考数学试题 (已下线)2023年四川省遂宁市中考数学真题变式题16-20题
更新时间:2023-03-13 20:07:50
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解答题-证明题
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【推荐1】如图,已知正方形ABCD的对角线相交于O,点E、F分别在AB与BC边上的点,且BE=CF.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/64bee02d-d083-4f40-99f2-954ba93aef0d.png?resizew=140)
(1)OE⊥OF.
(2)若正方形的边长为1cm,求出四边形OEBF的面积
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/5/64bee02d-d083-4f40-99f2-954ba93aef0d.png?resizew=140)
(1)OE⊥OF.
(2)若正方形的边长为1cm,求出四边形OEBF的面积
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【推荐2】如图,在矩形ABCD中,AC、BD交于点O,点E、点F分别在AO、DO上,且∠EBO=∠FCO.
(1)求证:EO=FO;
(2)若∠EBO=∠ACB=30°,BC=2
,求△BEO的面积.
(1)求证:EO=FO;
(2)若∠EBO=∠ACB=30°,BC=2
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/17/a11e7cb4-b4ea-474e-993a-009f8841c767.png?resizew=175)
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解答题-证明题
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适中
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【推荐2】如图,在
中,对角线
,
相交于点
,
,连接
,
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59dc730937fa9c5f46e69b48b399e8b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e4cb4069a2e1e90d1a9c4979ad09ca2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2e883f81c66ceef54d2d0556a68ed585.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85db79e5b017bed2a9397a7aff0dbe66.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/23/02f3afa1-77b2-4b59-af09-610c3ffc69be.png?resizew=189)
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解答题-证明题
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【推荐1】如图,已知四边形
是平行四边形,对角线
与
相交于点F,且
平分
,延长
过点D作
,交
的延长线于点C.
(1)求证:四边形
是菱形;
(2)若
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/868ff1350bd72625328c85c3097cd85e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fe2f6543e06a25493855fbbc648be6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/b41526d9-5080-4054-b234-87bb5b6585c3.png?resizew=175)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24b0b077bfd3700e78db35bea761ae29.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a4d8bf792d0cdf7bea7c5356360fee8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐2】如图,
中,
,点D,F分别是AC,AB的中点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/f9ba8ac4-c863-4213-a8a9-e9becaaf571a.png?resizew=220)
(1)求证:四边形DBEC是菱形:
(2)若
,
.求四边形DBEC面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de36aec23d150489da9166675afc849b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/90e70d5be99ab8b058ff2fb4d8c3d0d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c75c8881aff4af2e9a97569b78cddc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38e2a60cfcf81faf9da63c7070a201f0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/f9ba8ac4-c863-4213-a8a9-e9becaaf571a.png?resizew=220)
(1)求证:四边形DBEC是菱形:
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c85302e2d3d029538104e61f3651a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/696586347a5d0244b6f4cae99bd8e1e3.png)
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解答题-作图题
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【推荐3】下面是小溪同学设计的“利用直角三角形作矩形的尺规作图过程:
已知:如图,
是直角三角形,
,O是
中点.求作:点D,使得四边形
是矩形.
作法:①作射线
;
②以点O为圆心,
为半径画弧交
的延长线于点D;
③连接
、
,所以四边形
为矩形,点D即为所求.
根据小溪同学设计的尺规作图过程.
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明;
证明:∵
,
,
∴四边形
是平行四边形( )(填推理依据).
∵
,
∴
是矩形( )(填推理依据).
(3)在矩形
的边
上任取一点E,想在
、
、
上各找一点F、G、H,使得四边形
是菱形.(要求:利用直尺和圆规,作出图形,并写出简要作图过程)
已知:如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
作法:①作射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
②以点O为圆心,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf1438142deeac876fc7dc50552e552.png)
③连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
根据小溪同学设计的尺规作图过程.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/13/5998127f-aff4-45c5-9c1f-f39241239904.png?resizew=335)
(1)使用直尺和圆规,补全图形;(保留作图痕迹)
(2)完成下面的证明;
证明:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2fb91028cda3644b82b04da29cbe52.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5b9ea68dbddf33f0fed8f35a1fd5c90b.png)
∴四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)在矩形
![](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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
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