如图,在
中,
,点
是
边的中点,连接
,分别过点
,
作
,
交于点
,连接
,交
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/9dddbc6f-bfd2-4549-bcc3-af4a94db6139.png?resizew=345)
(1)求证:四边形
是矩形;
(2)若
,
,则
的长为___________.
![](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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.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/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aec5d3a183594be47dd6e386d2c9d725.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/9dddbc6f-bfd2-4549-bcc3-af4a94db6139.png?resizew=345)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8bc1cbcd6d00f0c36bad8254297d9f33.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc34db5860990e51ba31edc8cdd077c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29d186ff8551b1346bf67cdf1cebb8de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
2019·北京平谷·一模 查看更多[17]
【区级联考】北京市平谷区2019届九年级中考一模数学试题(已下线)专题14 图形的性质之解答题(3)《备战2020年中考真题分类汇编》(北京)2020年吉林省长春市中考数学评价检测试题北京市北京四中璞瑅学校2019-2020学年九年级下学期3月月考数学试题2020北京第十八中学九年级数学零模试题北京市丰台区2019-2020学年年九年级统一练习(三)数学试题2021年广东省深圳市中考模拟数学试卷(五)广东省茂名市茂南区2021-2022学年九年级上学期期末数学试题1广东省茂名市茂南区2021-2022学年九年级上学期期末数学试题2北京市广渠门中学2021-2022学年九年级下学期3月月考数学试题(已下线)专题07 四边形-2022年中考数学毕业班二轮热点题型归纳与变式演练(全国通用)江苏省盐都区第一共同体2021-2022学年九年级下学期第一次自主检测数学试题(一模)江苏省盐城市盐都区2021-2022学年九年级下学期3月月考数学试题(一模)吉林省长春市朝阳区长春南湖实验中学2022-2023学年九年级上学期期末数学试题山西省晋中市灵石县2022-2023学年九年级上学期12月月考数学试题北京市汇文中学2023-2024学年九年级下学期开学考数学试题2023年宁夏银川市唐徕回民中学南校区一模考试数学模拟试题
更新时间:2023-01-02 20:38:47
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解答题-证明题
|
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【推荐1】在△ABC中,AB=AC,D是BC边的中点,E、F分别是AD、AC边上的点.
(1)如图①,连接BE、EF,若∠ABE=∠EFC,求证:BE=EF;
(2)如图②,若B、E、F在一条直线上,且∠ABE=∠BAC=45°,探究BD与AE的数量之间有何等量关系,并证明你的结论;
(3)如图③,若AB=13,BC=10,AD=12,连接EC、EF,直接写出EC+EF的最小值.
(1)如图①,连接BE、EF,若∠ABE=∠EFC,求证:BE=EF;
(2)如图②,若B、E、F在一条直线上,且∠ABE=∠BAC=45°,探究BD与AE的数量之间有何等量关系,并证明你的结论;
(3)如图③,若AB=13,BC=10,AD=12,连接EC、EF,直接写出EC+EF的最小值.
![](https://img.xkw.com/dksih/QBM/2021/2/25/2665896553152512/2670894181179392/STEM/635ed5ae-7359-4981-8657-a4296abf57b8.png?resizew=637)
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解答题-问答题
|
适中
(0.65)
【推荐2】如图1,在
中,
,D是
的中点,过点B作
,垂足为E,连接
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/725a06ac-cb73-4a24-a3b1-df2aea7a9072.png?resizew=595)
(1)猜想
与
的数量关系,并说明理由;
(2)P是射线
上的点,过点C作
//
交
的延长线于点G.
①如图2,若点P在
的延长线上,请说明
的理由;
②若
,则
________.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/725a06ac-cb73-4a24-a3b1-df2aea7a9072.png?resizew=595)
(1)猜想
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d29e7c4d6216690152430b09f9cf0c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5157b42da58d55daad27d98b2fec15ff.png)
(2)P是射线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/abf80148409afb32ced0b4f59f1ba709.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
①如图2,若点P在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccaee8f228ff24e7c89879bb5b999cf2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa562a732c2af40c63d0152d26f061d9.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1c2b9125ec58510d4dc683b7a33f1b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f75158101661ac908d605abfe2048226.png)
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解答题-证明题
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真题
名校
【推荐1】如图,AB是圆O的直径,点D在直径AB上(D与A,B不重合),CD⊥AB,且CD=AB,连接CB与圆O交于点F,在CD上取一点E,使得EF=EC.
(1)求证:EF是圆O的切线;
(2)若D是OA的中点,AB=4,求CF的长.
(1)求证:EF是圆O的切线;
(2)若D是OA的中点,AB=4,求CF的长.
![](https://img.xkw.com/dksih/QBM/2020/7/27/2514915140247552/2514946504941568/STEM/be68cbd9870f499faf82e2a9df472086.png?resizew=197)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,已知
,
是正方形
的对角线
上的两点,且
.连接
,
,
,
.
的形状,并说明理由;
(2)若四边形
的周长为
且
求正方形
的边长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92034dd2bb9480b18709d01153467f8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
(2)若四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/910936ec9fb419d51ce2f5ea817f8401.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dc43718efdc0679b71bd91e3b96ca945.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1aa1e14c9d18f6f9f4f6ca33a2854d66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-证明题
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(0.65)
名校
【推荐1】如图,在四边形
中,
,
,
于点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/506ef882-2492-43a5-aa4e-f066cd04d3fa.png?resizew=167)
(1)求证:
;
(2)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/719d86287864e8d2c870817113296207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5e8335641ef424a83552098ceebf21c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/497846628a41a9bc750a645e045afb47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/13/506ef882-2492-43a5-aa4e-f066cd04d3fa.png?resizew=167)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/553a93e0b6156befa00b50bdfaef95d9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3656eaa49b4a0ee6b53fa963366c23b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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解答题-证明题
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适中
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【推荐2】如图,在平行四边形
中,E、F分别为边
、
的中点,
是平行四边形
的对角线,
交
的延长线于点G.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/75dcb665-ae4b-4654-b171-de82a1573e5a.png?resizew=184)
(1)求证:四边形
是平行四边形.
(2)若
,求
的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f010138182fdb4b78809403d097a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/8/75dcb665-ae4b-4654-b171-de82a1573e5a.png?resizew=184)
(1)求证:四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2330c01a4d2b5b20f106e3e48834d5c0.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38d00572a90232e08932317af2a53767.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a1e0a272aa29c4531aac22f28c64baf5.png)
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解答题-证明题
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适中
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名校
【推荐1】如图,以
ABC的AB边为直径作⊙O,交BC于点D.过点D作DE⊥AC于点E,DE与⊙O相切于点D.
(1)求证:∠B=∠C;
(2)延长DE交BA的延长线于点F,若⊙O的半径为4,sinC=
,求线段FA的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
(1)求证:∠B=∠C;
(2)延长DE交BA的延长线于点F,若⊙O的半径为4,sinC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6503ca085e3ca5f2ba723b0dd66e210b.png)
![](https://img.xkw.com/dksih/QBM/2021/4/20/2703658579656704/2704106003644416/STEM/badca0b1-6810-4f75-af47-02b76500d368.png)
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名校
【推荐2】如图,
是
的直径,弦
于
,过
延长线上一点
作
的切线交
的延长线于点
,切点为
,连接
交
于
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/199f3ac2-c057-4076-b660-dc95805b6cac.png?resizew=209)
(1)求证:
;
(2)若
,试判断
与
的位置关系,并说明理由;
(3)在(2)的条件下,若
,
,求
的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a7e4a6765ce78b05ee97764771e01f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf3834d7ec7531f3c3c0ce9b286f7a49.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/17/199f3ac2-c057-4076-b660-dc95805b6cac.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f043617f803828881a6d152dde02d3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00dd0ccdae720ba6e7241023a98f8f95.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc12eff1ddc83f80208a57f5e8fe1219.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9bdc9903f641ea7709bbb6f362295a3c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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