如图,在
中,
,
,
的垂直平分线
分别交
于点D,E.
是等腰三角形;
(2)若
的周长是13,
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee54b9b398ce80cd054b56173fe810f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5dc62e10004e73908091338362917da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7788830ed1cb3b9c5988f70f43595f2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
22-23八年级上·四川广元·期末 查看更多[10]
四川省广元市苍溪县2022-2023学年八年级上学期期末数学试题山西省大同市第一中学校南校2022-2023学年八年级上学期阶段性综合素养评价(四)数学试卷广东省佛山市顺德区京师励耘实验学校2022-2023学年八年级下学期第9周第一次核心素养展示数学试卷 广东省揭阳市普宁市赤岗中学等五校2022-2023学年八年级下学期月考数学试卷(3月份) (已下线)专题05 等腰三角形(五大类型)-2023-2024学年八年级数学上册《知识解读·题型专练》(苏科版)(已下线)专题03 等腰三角形的性质与判定综合(五大类型)-2023-2024学年八年级数学上册《知识解读·题型专练》(浙教版)广东省汕头市龙湖实验中学2022-2023学年八年级下学期开学考试数学试题(已下线)专题03 等腰三角形(六大类型)-2023-2024学年八年级数学上册《知识解读·题型专练》(人教版)吉林省吉林市昌邑区第九中学2023-2024学年八年级上学期期中数学试题天津市宁河区2023-2024学年八年级上学期期中数学试题
更新时间:2023-01-01 19:27:01
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解答题-证明题
|
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【推荐1】如图,
是等边三角形,
,
分别是边
,
上的点,
,
交于点
,
于点
,若
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb91cb9a5a14169845d700fbd95890ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d42218a68301d770accaaefb96b19f8a.png)
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【推荐2】某个零件的的形状如图所示,按规定∠A等于90°,∠B、∠D应分别等于20°和30°,小李量得∠BCD=145°,他断定这个零件不合格,你能说出其中的道理吗?
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/e2c9bc3d-8c3e-42c0-9888-4ef9239d98d8.png?resizew=119)
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【推荐1】如图,在
中,
,点D在边
上,将
经过旋转后与
重合.
(2)旋转角是多少度?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41bef89ac0dd5ae192cd9c7222d5041b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
(2)旋转角是多少度?
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名校
【推荐2】我们知道“三角形三个内角的和等于
”.若一个三角形三个内角的度数是
的正整数倍,则称这个三角形为“美丽三角形”.
如图,
,
平分
,点
分别是射线
上的动点(点
都不与点
重合),连接
,过点
作
,分别交
于点
.设
,
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/7839c445-9b5a-4a3f-bbb8-bf04083ce741.png?resizew=236)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/1708e7d1-d0f3-4e78-b73e-51ab2349d88b.png?resizew=240)
(1)若
,填空:
______度;图中“美丽三角形”的个数为______;
(2)当三角形
是“美丽三角形”时,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfe639eab78eafd2d40ea70aa5d3f21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76c12e76fbd84eeec721386bd3b04cc4.png)
如图,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6131160eaee962470abc7771df265c6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8044faecc4d5a611814a7f1e64dbf8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f6bce3d91ca23b86d8c6625f2632e437.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4a337fc72f8cd7f484f543874154aee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdbd924dd137d33a6aa3d70df0219f47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7789a500686c7a73770404ead6af0590.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/810eaa9636f3931ce1fc64e9b4d3df40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/7839c445-9b5a-4a3f-bbb8-bf04083ce741.png?resizew=236)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/1708e7d1-d0f3-4e78-b73e-51ab2349d88b.png?resizew=240)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea3d6bf5331fc5ea586cc5071711a995.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9251dff989f7d60db751b73033dee269.png)
(2)当三角形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e17dc84ba2e871aeb3a3fd2a2b5f1a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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解答题-作图题
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名校
【推荐1】如图,已知
,BD平分
.
(2)求证:四边形BFDE是菱形.
证明:∵BD平分![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
∴ ①
∵EF垂直平分BD
∴
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9736a7b904cd460837e9d22ab7882827.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f51dd2807fc3173cbc51b0aa1046f9b.png)
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4e3bee994cbe0dbed897141c54077f.png)
∴ ②
在
和
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6873e9a059a89a177b2e5461501c45.png)
∴
(ASA)
∴ ③
∵![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498c6ba8c5d560eef36044a53c7057ed.png)
∴四边形BFDE是平行四边形
∵ ④
∴平行四边形BFDE是菱形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
(2)求证:四边形BFDE是菱形.
证明:∵BD平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
∴ ①
∵EF垂直平分BD
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9736a7b904cd460837e9d22ab7882827.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f51dd2807fc3173cbc51b0aa1046f9b.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd4e3bee994cbe0dbed897141c54077f.png)
∴ ②
在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19697acb629aed98c7733bcffd56fd0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19ed92a6827783abceb6357e9369117a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c6873e9a059a89a177b2e5461501c45.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35f94fbaa8c3be3b18d5d9a04518f011.png)
∴ ③
∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/498c6ba8c5d560eef36044a53c7057ed.png)
∴四边形BFDE是平行四边形
∵ ④
∴平行四边形BFDE是菱形
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解答题-证明题
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【推荐2】教材呈现:如图是华师版八年级上册数学教材第94页的部分内容.请根据教材中的分析.
![](https://img.xkw.com/dksih/QBM/2022/1/9/2890971972755456/2891494396780544/STEM/9e57875e-7a98-421e-abab-58e88302c0fb.png?resizew=573)
(1)结合图①,写出“线段的垂直平分线质定理”完整的证明过程.
(2)定理应用:
如图②,在
中,
,AB的垂直平分线交AB于N,交AC于M.连接MB,若AB=8cm,
的周长是14cm.
①求BC的长;
②点P是直线MN上一动点,在运动的过程中,由P,B,C构成的
的周长是否存在最小值?若存在,标出点P的位置,并求
的周长最小值;若不存在,说明理由.
![](https://img.xkw.com/dksih/QBM/2022/1/9/2890971972755456/2891494396780544/STEM/9e57875e-7a98-421e-abab-58e88302c0fb.png?resizew=573)
(1)结合图①,写出“线段的垂直平分线质定理”完整的证明过程.
(2)定理应用:
如图②,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047dc9795efa99b6fb9fdf9778085dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cad3e2b2689dfe97ec82d473ab6cf469.png)
①求BC的长;
②点P是直线MN上一动点,在运动的过程中,由P,B,C构成的
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://img.xkw.com/dksih/QBM/2022/1/9/2890971972755456/2891494396780544/STEM/a45fa687-b932-44dc-99ed-56bba8bc7603.png?resizew=279)
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解答题-证明题
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【推荐1】如图,在△ABC中,AB=AC,D是BC边上的中点,连结AD,BE平分∠ABC交AC于点E.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/0fdc4561-13b2-4581-ac74-80546f51edac.png?resizew=172)
(1)若∠C=36°,求∠BAD的度数;
(2)过点E作EF
BC交AB于点F,求证:FB=FE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/26/0fdc4561-13b2-4581-ac74-80546f51edac.png?resizew=172)
(1)若∠C=36°,求∠BAD的度数;
(2)过点E作EF
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
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【推荐2】如图,在等腰直角△ABC中,
点D是斜边BC的中点,点E、F分别为AB、AC边上的点,且
.
![](https://img.xkw.com/dksih/QBM/2017/11/12/1815501449150464/1816212350648320/STEM/3a53296fa4de450e95b24f334ae04da7.png?resizew=121)
(1)判断
与
的大小关系,并说明理由;
(2)若BE=12,CF=5,求△
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a96948135a219a343e98fc19035a4f54.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3efffb3e6a571832b723b3c5795b8e8c.png)
![](https://img.xkw.com/dksih/QBM/2017/11/12/1815501449150464/1816212350648320/STEM/3a53296fa4de450e95b24f334ae04da7.png?resizew=121)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)若BE=12,CF=5,求△
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
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