【操作发现】如图①,剪两张对边平行的纸条,随意交叉叠放在一起,使重合的部分构成一个四边形
.转动其中一张纸条,发现四边形
总是平行四边形.其判定的依据是____________________.
【探究提升】取两张短边长度相等的平行四边形纸条
和
(
,
),其中
,
,将它们按图②放置,
落在边
上,
,
与边
分别交于点M,N.求证:
是菱形.
【结论应用】保持图②中的平行四边形纸条
不动,将平行四边形纸条
沿
或
平移,且
始终在边
上,当
时,延长
,
交于点P,得到图③.若四边形
的周长为40,且
与
之间的距离为8,则四边形
的面积为____________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba63d391602d0798a1875da35fef40d.png)
【探究提升】取两张短边长度相等的平行四边形纸条
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d09a9a6f020159406608000cf93d4fa9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/071805e94cb3c39a37a3151f65afe316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d163ba9cef35eb600387bcfbbda89ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2ab7ea8e7a0dc8c9f0b3a96a62c0eab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d830f2d923a554640d1d80abf3020606.png)
【结论应用】保持图②中的平行四边形纸条
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc0e8294c711a21ba01500869e6b122c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b39addc1173a458af87ed5c5e3f06466.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899df556f311b68eb9d57e2e938ff3b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35d58f9019097bd05037aefd5c322916.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/899df556f311b68eb9d57e2e938ff3b0.png)
23-24八年级下·河南周口·期中 查看更多[3]
河南省周口市扶沟县2023-2024学年八年级下学期期中数学试题(已下线)江苏省八年级数学下学期期末模拟试卷02-2023-2024学年八年级数学下学期考试满分全攻略高频考点+重难点讲练与测试(苏科版)(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 16:31:47
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【推荐1】如图,已知在四边形ABCD中,AE⊥BD于E,CF⊥BD于F,AE=CF,BF=DE,求证:四边形ABCD是平行四边形.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/28/52af66f6-6915-4cbb-8ade-64f1ebf09ad8.png?resizew=217)
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【推荐2】如图,在
的正方形网格中,每个小正方形的边长均为1,有线段
,点
、
均在小正方形的顶点上.
(1)以线段
为斜边作等腰
,画出
;
(2)以
为对角线作平行四边形
,画出平行四边形
,并求出平行四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d009739b5b5362c7902eeeada94adb3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/23/4170c332-f722-4de4-b7a0-d92425c5cac3.png?resizew=150)
(1)以线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)以
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,在平面直角坐标系中,矩形OABC的对角线OB,AC相交于点D,且BE∥AC,AE∥OB.
(1)求证:四边形AEBD是菱形;
(2)如果OA=4,OC=2,求出经过点E的反比例函数解析式.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/17/97d7c1aa-33e6-4f77-bce5-e15075fcb4f4.png?resizew=180)
(1)求证:四边形AEBD是菱形;
(2)如果OA=4,OC=2,求出经过点E的反比例函数解析式.
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【推荐2】综合与实践:
a.背景阅读:
宽与长的比是
(约为0.618)的矩形叫黄金矩形.黄金矩形给我们以协调、匀称的美感世界各国许多著名的建筑,为取得最佳的视觉效果,都采用黄金矩形的设计,如希腊的巴特农神庙等.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/7ba1a975-79db-434d-9b81-227e595bb647.png?resizew=478)
b.实践操作:
下面我们折叠出一个黄金矩形(如图所示):
第一步:在一张宽为2的矩形纸片的一端,利用如图①所示的方法折叠出一个正方形
,然后把纸片展平;
第二步:如图②,把这个正方形折成两个相等的矩形
和
,再把纸片展平;
第三步:折出矩形
的对角线
,并沿
折叠纸片,使点
落在
延长线上的点
处,如图③所示;
第四步:展平纸片,过点
折出
,使
和
垂直,得到矩形
,如图④,矩形
就是黄金矩形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ad5aadd5-bf60-48bc-8342-516ca5a2db34.png?resizew=382)
c.问题解决:
(1)图③中,
______(保留根号),四边形
的形状是______;
(2)请证明图④中的四边形
是黄金矩形;
(3)请在图④中再找出一个黄金矩形,这个黄金矩形是______(黄金矩形
除外,直接写出答案,不需证明,参考数值
)
a.背景阅读:
宽与长的比是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/029d393bb07b7140905b85f550519de4.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/7ba1a975-79db-434d-9b81-227e595bb647.png?resizew=478)
b.实践操作:
下面我们折叠出一个黄金矩形(如图所示):
第一步:在一张宽为2的矩形纸片的一端,利用如图①所示的方法折叠出一个正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9238757804254960bc40fa9d87065559.png)
第二步:如图②,把这个正方形折成两个相等的矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46b4ffe041a35a5cc95ad0536b366887.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f586e0ac7e6b48947fe4d031df382df.png)
第三步:折出矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4f586e0ac7e6b48947fe4d031df382df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d454c82d9e52747563d47b68099249.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
第四步:展平纸片,过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65c42bce098904b241986bb91c65ab33.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/31/ad5aadd5-bf60-48bc-8342-516ca5a2db34.png?resizew=382)
c.问题解决:
(1)图③中,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c26a46e7879436d532af3f4b6e258a81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d82c8a8d50ff378dc485a3df77f7f273.png)
(2)请证明图④中的四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
(3)请在图④中再找出一个黄金矩形,这个黄金矩形是______(黄金矩形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/840ea6bc07b112930a367fa5dab8ad30.png)
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【推荐1】如图,矩形纸片
(
)中,将它折叠,使点
与
重合,折痕
交
于
,交
于
,交
于
,连接
,
.
![](https://img.xkw.com/dksih/QBM/2020/3/20/2423477613133824/2423681605550081/STEM/b31edd4fff264521b2cf775cb501dbaf.png?resizew=144)
(1)求证:
;
(2)求证:四边形
是菱形;
(3)若
,
,求四边形
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/deb6694f3443cc5f4d09948679251b61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://img.xkw.com/dksih/QBM/2020/3/20/2423477613133824/2423681605550081/STEM/b31edd4fff264521b2cf775cb501dbaf.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f91470c80885ebb4916e4593df930d6.png)
(2)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9766e5eb6796dafc5ffe212afdfc43c0.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/086f32a5cd3e16d41b6a5b63c82ac657.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
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【推荐2】如图,已知
的对角线
、
交于点
,且
.
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750494255251456/2750611272458240/STEM/0d3ce460721d48bea2d6a436e12d2203.png?resizew=202)
(1)求证:
是菱形.
(2)
为
上一点,连接
交
于
,且
,若
,
,则四边形
的面积
________.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://img.xkw.com/dksih/QBM/2021/6/25/2750494255251456/2750611272458240/STEM/0d3ce460721d48bea2d6a436e12d2203.png?resizew=202)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d38d97f03faed3152db2fd3bd1919944.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae341f580ff8fbf21f616fe900b0e4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f08273d339dc5ddbb89aa67bb8205e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6706fe00b4e231e62d9ecbec567d526b.png)
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