如图,在矩形ABCD中,点O为对角线AC的中点,过点O作
交BC于点E,交AD于点F,连接AE,CF.
(1)求证:四边形AECF是菱形;
(2)连接OB,若
,
,求OB的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8de4a54cc7818be87a239f6de5f5d05b.png)
(1)求证:四边形AECF是菱形;
(2)连接OB,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f21d8e7af78693e5da7957c8034e8bcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/7/9535d9ab-43c6-49ab-a5dc-8d2772bd9f40.png?resizew=205)
19-20八年级下·广东惠州·期末 查看更多[9]
广东省惠州市惠东县2019-2020学年八年级下学期期末数学试题(已下线)第十八章 平行四边形【压轴题专项训练】-2020-2021学年八年级数学下学期期末专项复习(人教版)江苏省镇江市句容市、丹徒区2020-2021学年八年级下学期期末数学试题河北省石家庄市平山县外国语中学2020-2021学年八年级下学期第三次月考数学试题湖南省常德市第五中学2021-2022学年九年级上学期入学数学试题广东省茂名市东山街道三校联考2021-2022学年九年级上学期第一次月考数学试题(已下线)专题18.17 直角三角形斜边上的中线(专项练习)-2020-2021学年八年级数学下册基础知识专项讲练(人教版)海南省海口市秀英区北京大学附属中学海口学校2020-2021学年八年级下学期期中数学试题广东省佛山市英才实验学校2021-2022学年九年级上学期期末数学试题
更新时间:2021-06-26 13:45:00
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解答题-证明题
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【推荐1】如图,在矩形
中,点
在
边上,且
,作
于点
.
![](https://img.xkw.com/dksih/QBM/2022/4/29/2975746062548992/2982516212858880/STEM/252ea1c17e86430593b7d51ebea85824.png?resizew=158)
(1)求证:
;
(2)若
平分
,
,求矩形
的面积
.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30e50e094cd2849e38859b36aad0b0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8689d619c2508c9000531fc1b8f1f21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/2022/4/29/2975746062548992/2982516212858880/STEM/252ea1c17e86430593b7d51ebea85824.png?resizew=158)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e444739e269a94733b2b0598b559313.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/377b5f7197e5bd1afeea4d931307956a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-作图题
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【推荐2】如图,矩形
中,
为边
上方一点,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/d2876a15-a862-4cfb-a27a-7811f8c043ac.png?resizew=424)
(1)在图1中,请仅用无刻度的直尺作出
边的中点
;
(2)如图2,在(1)的条件下,连接
,若四边形
为菱形,请探究
之间的数量关系.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5197f7d5c55ea4d9a01cabd662e44c1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/24/d2876a15-a862-4cfb-a27a-7811f8c043ac.png?resizew=424)
(1)在图1中,请仅用无刻度的直尺作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
(2)如图2,在(1)的条件下,连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47634f89fd034afac3d7305730458df0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48a61d8bedef61745ee4fd89a8c0c119.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3355e2fa0ac6c675f02ee36c3ced4f2d.png)
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【推荐1】如图,平行四边形ABCD的对角线AC、BD交于点O,分别过点C、D作CF∥BD,DF∥AC,连接BF交AC于点E.
(1)求证:△FCE≌△BOE;
(2)当△ADC满足什么条件时,四边形OCFD为菱形?请说明理由.
(1)求证:△FCE≌△BOE;
(2)当△ADC满足什么条件时,四边形OCFD为菱形?请说明理由.
![](https://img.xkw.com/dksih/QBM/2021/10/14/2829232694124544/2830007830265856/STEM/a230ab3e-267a-4160-917e-5d7beb5449e4.png)
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【推荐2】如图,在矩形ABCD中,AD=8,AB=6,对角线相交于O点,把△OCD沿直线CD翻折得△PCD.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/da585c69-4ab5-49a4-bc15-da747704e95f.png?resizew=194)
(1)试判断四边形CPDO是什么特殊四边形,并说明理由;
(2)求四边形CPDO的面积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/13/da585c69-4ab5-49a4-bc15-da747704e95f.png?resizew=194)
(1)试判断四边形CPDO是什么特殊四边形,并说明理由;
(2)求四边形CPDO的面积.
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