如图,在
中,
为
边上一点,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/6bbd8ca8-09d8-4d98-858e-0e930f26ad1b.png?resizew=282)
(1)求证:
≌
;
(2)若
,求
的度数;
(3)若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.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/48a277db452e76240ec83ec6a2864bdd.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/11/6bbd8ca8-09d8-4d98-858e-0e930f26ad1b.png?resizew=282)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22ad7a39b2ad0a811b534c2e764a72af.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ee5bb59fa97c3d92b2927014a55d1b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdb8eca20ce2c918ea4034ea15210c7f.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11067c50eb9a389effe4912995d6b82f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
更新时间:2022-06-29 22:35:58
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【推荐1】(1)已知:如图1,
为等边三角形,点D为
边上的一动点(点D不与B、C重合),以
为边作等边
,连接
.求证:
;聪明的小明做完上题后进行了进一步变式探究.
(2)如图2,在
中,
,
,点D为
延长线上的一动点,以
为边作等腰
,
(顶点A、D、E按逆时针方向排列),
,类比题(1),请你猜想线段
之间会有怎样的关系,并说明理由
②点F为
中点,连接
和
,若
,求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.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/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8167906b42df2dc552b1208d397adb10.png)
(2)如图2,在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c06154cae3bf7a8ce5a1e97a7380875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d384390f4e0a1e0abd4cc19382d94db.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/40e7ba6e267dde1a65a98f9f36b585ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31e3b8b36fc31644f5e121300645befc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff0cda142b76c4aa8bac00478f8104f7.png)
②点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b61601ecf8de47ed9b84ee59d65f8118.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
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【推荐2】如图所示,在△ABC中(AB>AC),D、E分别在BC和BC的延长线上,且AD=AE,∠BAC=∠DAE,点K、H分别在BA上,点D、G分别在BC上,且BK=BD,BH=BG,连接KG并延长与AC延长线交于点F,且CF=CE.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/4571b4fd-dd38-4e2b-b3e6-1b3cf183b2d8.png?resizew=188)
(1)求证:DH=KG;
(2)求证:G为KF中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/24/4571b4fd-dd38-4e2b-b3e6-1b3cf183b2d8.png?resizew=188)
(1)求证:DH=KG;
(2)求证:G为KF中点.
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【推荐1】某中学八(1)班小明在综合实践课上剪了一个四边形ABCD,如图,连接AC,经测量AB=12,BC=9,CD=8,AD=17,∠B=90°.求证:△ACD是直角三角形.
![](https://img.xkw.com/dksih/QBM/2020/3/25/2426972193816576/2428452739571712/STEM/e9b8dbb827fe43cb95dfbe0a0dbc9258.png?resizew=152)
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【推荐2】如图,在▱ABCD中,过B点作BM⊥AC于点E,交CD于点M,过D点作DN⊥AC于点F,交AB于点N.
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(2)已知AF=12,EM=5,求AN的长.
(1)求证:四边形BMDN是平行四边形;
(2)已知AF=12,EM=5,求AN的长.
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【推荐1】如图,在
中,
交
于点F.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/5f4bc2a1-576b-4a34-ab4e-31747755680e.png?resizew=149)
(1)求证:
;
(2)如果
的面积为
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5138a9f70d5e8b0580e30fef6eb7baef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c0efce3b80bfd37fb91b48b432b5c01.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/1/5f4bc2a1-576b-4a34-ab4e-31747755680e.png?resizew=149)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5dd0a04b4d04a7ee193d54fa3c34b3.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5df7626240940eb340420a605e95aeee.png)
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