如图,在
中,
,
,
是
的一个外角的平分线,点D在
的延长线上,连接
,
,
,且
.求证:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/64f78b17-82c6-4fd3-8587-f8841d776833.png?resizew=265)
(1)
是等边三角形;
(2)求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1ce7f6d278f2ef7a193b7eed7be6b3c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05740f0c6071846227dc0ec177ad15e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a424b50eaeafa6f302ffd95476cb86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f38105b701adcd96b87f27225ca14e95.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/8/64f78b17-82c6-4fd3-8587-f8841d776833.png?resizew=265)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/101da161ae17652ccbe7d3f888762c2d.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3da492fce0348f90fde6d56314af0230.png)
22-23八年级上·湖北省直辖县级单位·期末 查看更多[2]
湖北省仙桃市第二中学2022-2023学年八年级上学期期末网考数学试题(已下线)专题09 全等三角形证明方法:截长补短【考点串讲+热点题型专训】-2022-2023学年七年级数学下学期期中期末考点大串讲(北师大版)
更新时间:2023-01-05 21:59:43
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解答题-问答题
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适中
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名校
【推荐1】如图,已知点
在同一条直线上,
,
,
.请你判断,
与
相等吗?请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fd157aaee7c9ee1ba28cf9081de8d71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a510a3eb906b3ef0760b0d1723d11ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/439fbb8974a5f907205d26b47b420bf4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0cf6e389ec93415eee75a88968e418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://img.xkw.com/dksih/QBM/2020/5/2/2453912447197184/2454997190942721/STEM/d3906ed57b154d32b7aec45e346a614e.png?resizew=138)
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【推荐2】已知,如图,Rt△ABC中,∠BAC=90°,AB=AC,点D是BC上任意一点,过B作BE⊥AD于点E,过C作CF⊥AD于点F.
求证:BE=CF+EF.
求证:BE=CF+EF.
![](https://img.xkw.com/dksih/QBM/2019/4/22/2187843492159488/2188479665504256/STEM/4a944199fa384963a730e3b2cbb739c0.png?resizew=166)
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解答题-证明题
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【推荐1】如图,
是
的平分线,
,点P在
上,
,
,垂足分别是M,N.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d39b8d91afc34e4a9b0fdbb6bafb9087.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07e395831eddeca6f5ae769b2dfa2b4d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/26/2bba3720-eadf-45ff-995c-7d0b95950e09.png?resizew=196)
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解答题-作图题
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【推荐2】作图题
(1)①在图中画出与△ABC关于直线l成轴对称的△AB′C′;
②△ABC的面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/9d72c16c-4146-426d-a4c1-58efdf8b6bea.png?resizew=160)
(2)如图,已知,在Rt ΔABC中,∠ABC=90°,AC=5,用尺规在BC边上求作一点D,使D到AC的距离等于DB的长;若BD=3,则△ACD的面积= .
(1)①在图中画出与△ABC关于直线l成轴对称的△AB′C′;
②△ABC的面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/9d72c16c-4146-426d-a4c1-58efdf8b6bea.png?resizew=160)
(2)如图,已知,在Rt ΔABC中,∠ABC=90°,AC=5,用尺规在BC边上求作一点D,使D到AC的距离等于DB的长;若BD=3,则△ACD的面积= .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/12/7be8c480-f067-4d02-bf73-9f46400732e8.png?resizew=112)
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【推荐1】如图,在
中,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476fc371ab065330fdabbdce5c37f316.png)
,连接
,恰有
,过点 D 作
于点E.动点P从点 D出发沿
以1
的速度向终点A 运动,同时点Q从点B出发,以3
的速度沿射线
运动,当点P到达终点时,点Q也随之停止运动,设点P的运动时间为t
.
和
的长度;
(2)连接
,当
时,判断
与
是否垂直,并说明理由;
(3)请直接写出当t为何值时,以P,Q,C,D为顶点的四边形为平行四边形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/476fc371ab065330fdabbdce5c37f316.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/02b6d19fedaf8488f9637cd64efbca83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bffd657e48b15b9b54a55817e2c26b22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d822262ff00915910e5b87d81ad1ba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1dce4a03cf2c9a68b2399d4339a035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc1dce4a03cf2c9a68b2399d4339a035.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65502a7ea4d1ce6d6d8c720845c73e0.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
(2)连接
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209f628619c849207905b3d2bd3f07b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a5f1641947153c80b987320885a2b57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
(3)请直接写出当t为何值时,以P,Q,C,D为顶点的四边形为平行四边形.
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【推荐2】已知:等边
中,
,
于点
,以
为边,在
下方作等边
.
(1)请直接写出线段
与
的数量关系 ;
(2)若点
在射线
上,且在
的外部,
与
的关系是否还存在,并说明理由;
(3)直接写出
周长的最小值为 .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0213c5787a5a6b38d11bceca5567f67.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/954f5088-adf8-4350-9a0b-58df27ed41a5.png?resizew=307)
(1)请直接写出线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9f79d7939c88e9702962e5917cad290.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e8120f2eeb724c756b5f84a14c6df527.png)
(2)若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
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(3)直接写出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de3a8deac36e5cdc2d67a0142b5326fb.png)
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解答题-证明题
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【推荐1】已知如图等腰△ABC,AB=AC,∠BAC=120°,AD⊥BC于点D,点P是BA延长线上一点,点O是线段AD上一点,OP=OC,
![](https://img.xkw.com/dksih/QBM/2019/11/2/2325080050720768/2326150941802496/STEM/5e1d3934fc20472c9e4bf1a83e55a144.png?resizew=145)
(1)证明:∠APO+∠DCO=30°;
(2)判断△OPC的形状,并说明理由.
![](https://img.xkw.com/dksih/QBM/2019/11/2/2325080050720768/2326150941802496/STEM/5e1d3934fc20472c9e4bf1a83e55a144.png?resizew=145)
(1)证明:∠APO+∠DCO=30°;
(2)判断△OPC的形状,并说明理由.
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【推荐2】如图,等边△ABC内接于⊙O,P是
上任一点(点P不与点A、B重合),连AP、BP,过点C作CM∥BP交PA的延长线于点M.
(1)填空:∠APC= 度,∠BPC= 度;
(2)求证:△ACM≌△BCP;
(3)若PA=1,PB=2,求梯形PBCM的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
(1)填空:∠APC= 度,∠BPC= 度;
(2)求证:△ACM≌△BCP;
(3)若PA=1,PB=2,求梯形PBCM的面积.
![](https://img.xkw.com/dksih/QBM/2017/11/13/1816194536546304/1817264031563776/STEM/1c8d0c99bc8641d6a53d74f863934544.png?resizew=144)
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