如图,平行四边形
中,
,
,
,点G是
的中点,点E是边
上的动点,
的延长线与
的延长线交于点F,连接
,
.
_______
时,四边形
是菱形;
②当
_______
时,四边形
是矩形;
请选择其中一个结论证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6747441b260ca043446b5d472fece440.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf2732c063f01d83e8f7cfc2b138732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e55e398e8520d8a36fb5a625a085b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32217457c4e96e2ef155cf15c1b65d97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/af045d2542c40f955a9de356b9b088c4.png)
请选择其中一个结论证明.
23-24八年级下·山东临沂·期中 查看更多[2]
山东省临沂市河东区2023-2024学年八年级下学期期中数学试题(已下线)清单02 中心对称图形-平行四边形 全章复习(2个考点梳理+10种题型解读)-2023-2024学年八年级数学下学期期末考点大串讲(苏科版)
更新时间:2024-06-16 18:55:57
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解答题-作图题
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适中
(0.65)
【推荐1】如图,已知
,
,将
绕点
逆时针旋转
得到
,其中点
与点
对应,点
与点
对应.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/7/90a443d6-2b79-4f9a-906b-00c037c1ae9c.png?resizew=177)
(1)作出
尺规作图,保留作图痕迹,不写作法
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e12142a1fe7a56258c769c7f288e8c24.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aefe4a3e7a7fa195ed6a6712447639b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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(1)作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc295ae44a47224f57e49bfe89246011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/987517758fad59f6f695761deb2a5ebd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cff41783418c5e11f70c71ee2e137566.png)
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解答题-证明题
|
适中
(0.65)
真题
【推荐1】如图,四边形
是平行四边形,
且分别交对角线
于点E,F.
![](https://img.xkw.com/dksih/QBM/2021/6/30/2754045015490560/2754238770257920/STEM/eb7a2f8b26824ce3ab68084b386f44b4.png?resizew=222)
(1)求证:
;
(2)当四边形
分别是矩形和菱形时,请分别说出四边形
的形状.(无需说明理由)
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(1)求证:
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(2)当四边形
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解答题-作图题
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适中
(0.65)
【推荐2】如图,在边长为
个单位的正方形网格中,
经过平移后得到
,图中标出了点
的对应点
.根据下列条件,利用网格点和无刻度的直尺画图并解答相关的问题保留画图痕迹:
;
(2)连接
、
,那么
与
的关系是_______;
(3)画出
的边
上的高
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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(2)连接
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(3)画出
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
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解答题-证明题
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适中
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【推荐1】如图,在平行四边形
中,点E,F在对角线
所在直线上,
.
;
(2)连
,
.请添加一个条件,使四边形
为矩形,并需要说明理由.
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(2)连
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解答题-问答题
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适中
(0.65)
【推荐2】如图,
的对角线
交于点O,过点B作
,过点C作
,
与
相交于点P.
(1)判断四边形
的形状_________.
(2)连接
交
于点M,
①四边形
是什么四边形,请给予说明.
②线段
与
关系是_________.
(3)若得到矩形
,则
是_________.若得到正方形
,则
是_________.
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(1)判断四边形
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(2)连接
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①四边形
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②线段
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(3)若得到矩形
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解答题-证明题
|
适中
(0.65)
名校
【推荐1】如图,在△ABC中,∠ABC=60°,⊙O是△ABC的外接圆,过点A作⊙O的切线,交CO的延长线于点M,CM交⊙O于点D.
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(1)求证:AM=AC;
(2)填空:
①若AC=6,MC=________;
②连接BM,当∠AMB的度数为________时,四边形AMBC是菱形.
![](https://img.xkw.com/dksih/QBM/2020/11/15/2593213974405120/2593720462893056/STEM/9851ba0e95584d2ab48d927e4c163624.png?resizew=195)
(1)求证:AM=AC;
(2)填空:
①若AC=6,MC=________;
②连接BM,当∠AMB的度数为________时,四边形AMBC是菱形.
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解答题-问答题
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名校
【推荐2】实践与探究:
问题情景:数学实践课上,老师让同学们以平行四边形为主题展开数学活动.
如图,
中,
,
,
.对角线
、
相交于点
,将直线
绕点
顺时针旋转
,分别交直线
、
于点
、
.
(1)操作发现:当
______时,四边形
是平行四边形;
(2)思考表达:在旋转的过程中,四边形
可能是菱形吗?如果能,求出此时
的值;如果不能,说明理由;
(3)拓展延伸:在旋转过程中,是否存在以
、
、
、
、
、
中的4个点为顶点的四边形是矩形?如果存在,直接写出矩形的对角线的长度;如果不存在,说明理由.
问题情景:数学实践课上,老师让同学们以平行四边形为主题展开数学活动.
如图,
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(1)操作发现:当
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