1 . 在平面直角坐标系中,
,
,点
绕点
旋转
得到点
,则点
的坐标为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8748dc55e2f45bc37fc4d84d7310f79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba807aba93509588a99824cf24e2e64f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
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名校
2 . 如图,
为
的直径,
为
上一点,连接
,过
作
于点
,过点
作
,其中
交
的延长线于点
.
(1)求证:
是
的切线.
(2)如图,点
在
上,且满足
,连接
并延长交
的延长线于点
.
①试探究线段
与
之间满足的数量关系.
②若
,
,求线段
的长.
![](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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6b1bd1adfe4cc6566218f19970c2fd3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b757f0c42ae5c9a2d6a4b19e5877b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/487a60bae703dff795b5f2ddf39d660f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/a755e7d7-1566-465d-947f-dce786a69900.png?resizew=151)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)如图,点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a692b803433d9aeb8a5a7b97bfd7f28.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fc56c77464a17a1e97b568762a3e2c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/15/2f175742-f1e2-4a51-a927-2bef4c8cd6bb.png?resizew=147)
①试探究线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
②若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e673ef2d48215ca84a48377f17d6df00.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/714cc3707bba3bfdb56e251999be8592.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
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3 . 李倩同学在学习中善于总结解决问题的方法,并把总结出的结果灵活运用到做题中.例如,总结出“图形中有角平分线+平行线,通常会出现等腰三角形”后,老师出了这样一道题:
(1)如图1,在矩形ABCD中,F是BC边上的一点,AE平分∠FAD,与CD交于点E,与BC的延长线交于点M,E是CD的中点,请问 AF=FC+AD成立吗?
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213268480/STEM/e00f466c53174ab29e4c4f9c1f7961f7.png)
(2)若把矩形ABCD变成平行四边形ABCD(如图2),其它条件不变,你的结论还正确吗?说明理由.
(1)如图1,在矩形ABCD中,F是BC边上的一点,AE平分∠FAD,与CD交于点E,与BC的延长线交于点M,E是CD的中点,请问 AF=FC+AD成立吗?
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213268480/STEM/e00f466c53174ab29e4c4f9c1f7961f7.png)
(2)若把矩形ABCD变成平行四边形ABCD(如图2),其它条件不变,你的结论还正确吗?说明理由.
![](https://img.xkw.com/dksih/QBM/2014/9/2/1573748207067136/1573748213268480/STEM/983416bb5cf04e76b5f4cdb7b8c61ee5.png)
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