如图,将一边长为15的正方形纸片
的顶点A折叠至
边上的点
,使
,折痕为
,则
的长为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb388a36bd5caaa51b7e3c898e3c906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
A.15 | B.16 | C.17 | D.18 |
23-24八年级下·黑龙江哈尔滨·期中 查看更多[2]
黑龙江省哈尔滨市第十七中学校2023-2024学年八年级下学期期中数学试题(已下线)专题06 四边形模型(六大题型)-【好题汇编】备战2023-2024学年八年级数学下学期期末真题分类汇编(山东专用)
更新时间:2024-05-31 18:31:35
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【推荐1】如图
中,
.
为
中点,
为
上一点,
交DE的延长线于点
.则四边形
周长的最小值是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/26/e8c4fb29-4386-4e48-b12a-e20681238bb5.png?resizew=189)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9db7d35a4c60cc4ec66e119c287e4513.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe446a0456e9168028baee032d8d7d23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c5f0d36d436eec20eeb17bb72c7dede.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/376d1d2761ad22087194d320d2ec9c87.png)
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A.16 | B.17 | C.18 | D.19 |
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【推荐2】如图,CD∥AB,OE平分∠AOD,OF⊥OE,OG⊥CD,∠D=50°,则下列结论:①∠AOE=65°;②OF平分∠BOD;③∠GOE=∠DOF;④∠GOE=25°.其中正确的是:( )
![](https://img.xkw.com/dksih/QBM/2017/5/11/1684663791181824/1688179386793984/STEM/8f249b2e6119435cb908a7a7bf099121.png?resizew=163)
![](https://img.xkw.com/dksih/QBM/2017/5/11/1684663791181824/1688179386793984/STEM/8f249b2e6119435cb908a7a7bf099121.png?resizew=163)
A.①②③ | B.①②④ | C.②③④ | D.①②③④ |
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【推荐1】三国时期的赵爽利用图1证明了勾股定理,后来日本的数学家关孝和在“赵爽弦图”的启发下利用图2也证明了勾股定理.在图2中,E,B,F在同一条直线上,四边形
,
,
都是正方形,若正方形
的面积等于100,
面积等于
,且已知
,则
的面积等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/9fd81e82-967a-4ce4-abc7-883e5377660e.png?resizew=218)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6019bea48cccbeb357703a58eb012303.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8fde6ad88e4b36d9459dadc1a774d8b7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/141958753c360d95a0b896589b0a7d11.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/15/9fd81e82-967a-4ce4-abc7-883e5377660e.png?resizew=218)
A.![]() | B.39 | C.![]() | D.52 |
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【推荐2】如图,在等腰三角形
中,
,
平分
,
,
,则图中阴影部分的面积是( )
![](https://img.xkw.com/dksih/QBM/2023/12/26/3397551010480128/3398018490261504/STEM/2afad56a98fa418eb70a8d6af7801fb5.png?resizew=108)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0d5a2cd05e4476fc72271e8fdb59a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7eb3d1070981fed5ca65a34bb2282e6f.png)
![](https://img.xkw.com/dksih/QBM/2023/12/26/3397551010480128/3398018490261504/STEM/2afad56a98fa418eb70a8d6af7801fb5.png?resizew=108)
A.3 | B.6 | C.9 | D.12 |
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【推荐1】如图,
是
的直径,
是弦,点
在直径
的两侧.若
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2020/7/25/2513484226674688/2513577092603904/STEM/89b736b93aed4b3eb0cac8090c7dcb49.png?resizew=163)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,点
为矩形
的中心,
的半径为2,点
是
上一个动点,则
面积的最小值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/12/f415c225-dc61-46b3-aa95-e03d39cb007e.png?resizew=167)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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A.9 | B.8 | C.![]() | D.7 |
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【推荐1】如图,正方形ABCD中,AB=6,点E在边CD上,且CD=3DE,将△ADE沿AE对折至△AFE,延长EF交边BC于点G,连接AG、CF,则下列结论:
①△ABG≌△AFG;②BG=CG;③AG∥CF;④S△EGC=S△AFE;⑤∠AGB+∠AED=145°.
其中正确的个数是( )
①△ABG≌△AFG;②BG=CG;③AG∥CF;④S△EGC=S△AFE;⑤∠AGB+∠AED=145°.
其中正确的个数是( )
A.2 | B.3 | C.4 | D.5 |
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【推荐2】如图,在正方形ABCD中,E、F分别为BC、CD的中点,连接AE,BF交于点G,将△BCF沿BF对折,得到△BPF,延长FP交BA延长线于点Q,下列结论:①AE=BF;②AE⊥BF;③QF=QB;④S四边形ECFG=S△ABG.正确的个数是( )
![](https://img.xkw.com/dksih/QBM/2022/1/4/2887198258429952/2888604828729344/STEM/dcda3927-b43a-49ed-841a-44b3e801587f.png?resizew=179)
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