如图,在
和
中,
,
,
,点C在边AB上,点 G是线段AD的中点.
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645862407995392/2645874566086656/STEM/3343b7da-da5c-45f1-8529-ad0f640de934.png)
(1)求
的度数;
(2)求证:OG平分
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/866b81a8384cce4f24867baca2e6820c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a9a6eeeebf3cff569578d7366b755aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fca3734de79f7f50b552ef62b29dc7c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/33cbad6599796efc1c177ae9349feda9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3d3c378b1118d331d30b63fc587b270.png)
![](https://img.xkw.com/dksih/QBM/2021/1/28/2645862407995392/2645874566086656/STEM/3343b7da-da5c-45f1-8529-ad0f640de934.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/246a86f34603eaf2e6a948681b831b0d.png)
(2)求证:OG平分
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d7b2fe01a33c4825f9974ed9663a99c.png)
更新时间:2021-01-28 15:08:29
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解答题-问答题
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适中
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【推荐1】在
中,
,
是边
上的动点,过点
作
交
于点
,将
沿
折叠,点
的对应点为点
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/29c72afe-8f2c-4226-9ed7-0d9764c3b7c8.png?resizew=337)
(1)如图1,若点
恰好落在边
上,则
的形状是___________ 三角形;
(2)如图2,若点
落在
内,且
的延长线恰好经过点
,
,求
的度数;
(3)若
,当
是直角三角形时,直接写出
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/284e282bb1d9fbf8634b3506ee5358ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.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/c436f108fd4921dae15ecff19270237e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/30/29c72afe-8f2c-4226-9ed7-0d9764c3b7c8.png?resizew=337)
(1)如图1,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
(2)如图2,若点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab618c936da03808cb9953783d42b30.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d649afbddd907f0dfec1420f02f82fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7e64c953aaf341e772a5fe776fbc78a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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解答题-证明题
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【推荐2】如图,在
中,
.
是
的外接圆,
为弧
的中点,
为
延长线上一点.
(1)求证:
;
(2)若
,求
的度数.
![](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/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/4/3406904b-d1e4-4f93-9b0a-a03c64830f4d.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44955e3572af2b658926043e3c811188.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c769090b5a79d9d21f7e9b6a95468b47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57e7106619c08f2bcc1d21f846e8a0de.png)
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【推荐1】如图,Rt△ABC中,∠ACB=90°,AC=BC,P为△ABC内部一点,且∠APB=∠BPC=135°
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847399179984896/2848307178291200/STEM/ad6f2a6d-99ce-4d9c-a8d8-e52ff04c56a5.png)
(1)求证:∠CAP=∠BCP:
(2)判断PA和PC数量关系,并说明理由
![](https://img.xkw.com/dksih/QBM/2021/11/9/2847399179984896/2848307178291200/STEM/ad6f2a6d-99ce-4d9c-a8d8-e52ff04c56a5.png)
(1)求证:∠CAP=∠BCP:
(2)判断PA和PC数量关系,并说明理由
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【推荐2】D是
的边
上的一点,E是边
边的中点,过点C作
的平行线,交
的延长线于点F,连接
.
是平行四边形.
(2)已知
,请填空:
①当
时,四边形
是矩形;
②当
时,四边形
是菱形.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fff634c513b42d20794cd8d4195e196e.png)
(2)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccf5e18fe0ca0e4bb71885084e47af41.png)
①当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
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②当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9f63d194aa0d4091618b6f41f569ee2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d54f59859698f3cfdfe285b3cdb95125.png)
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