如图,在
中,
,以
为直径作
,交底边
于点D,过点D作
于点G,延长
交
于点E,连接
,交
于点F.
是
的切线;
(2)若
,求
的半径.
![](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/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d222d3bcc808dd5b62b2a9ccb543a6d7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14b49022a6f55817b5d7e3ab443b5491.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1a6c6e7c025362c46a64a8956761f08e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7935ad59079c158ea0f92018fc548e4a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faf02dc666724df129f8d3a80a51d853.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
2023·贵州贵阳·二模 查看更多[2]
更新时间:2024-04-05 20:32:40
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解答题-证明题
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【推荐1】完成下面的证明.
已知:如图,,
,
分别是
,
的平分线,求证:
.
证明:∵(已知),
∴( )
∴ ( )
∵,
分别是
,
的平分线(已知)
∴ ,
( )
∴
∴( ).
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【推荐2】如图,
,点
在
上,
、
、
三点在同一条直线上,且
.求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/333ab24c4935210f4c232cd0c0fae358.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e53497af8899cb299d762f1a4f46a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75d2e5e5ec3caea31e3928183eebbc2b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/4/3cb37dbe-76dc-49ff-8721-7c14c83180fa.png?resizew=177)
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解答题-问答题
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【推荐1】如图,在直角三角形ABC中,直角边
,
.设P,Q分别为AB、BC上的动点,在点P自点A沿AB方向向B作匀速移动的同时,点Q自点B沿BC方向向点C作匀速移动,它们移动的速度均为每秒1cm,当Q点到达C点时,P点就停止移动.设P,Q移动的时间t秒.
![](https://img.xkw.com/dksih/QBM/2021/11/22/2856896888020992/2858774044647424/STEM/681d172f-a666-4ca7-87f5-a7ea49b8bd43.png)
(1)当t为何值时,
是以
为顶角的等腰三角形?
(2)
能否与直角三角形ABC相似?若能,求t的值;若不能,说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/818309e7b9a67c54ab1530fdb4b0edc0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9547f6b5c7c54d216ecea72becb7d373.png)
![](https://img.xkw.com/dksih/QBM/2021/11/22/2856896888020992/2858774044647424/STEM/681d172f-a666-4ca7-87f5-a7ea49b8bd43.png)
(1)当t为何值时,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febc9a89d0d1c97b88c0f4acd32b4e67.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c495b8fd7f7bb21c177c9d50fbf6919.png)
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【推荐2】阅读下面材料:
数学课上,老师给出了如下问题:
如图,AD为△ABC中线,点E在AC上,BE交AD于点F,AE=EF.求证:AC=BF.
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859499496112128/2864511396257792/STEM/bae1f77ba8754514be6b0afdd291d6be.png?resizew=173)
经过讨论,同学们得到以下两种思路:
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859499496112128/2864511396257792/STEM/7e2df1e3d7d04438a8349806518c7d1c.png?resizew=330)
完成下面问题:
(1) ① 思路一的辅助线的作法是: ;
② 思路二的辅助线的作法是: .
(2)请你给出一种不同于以上两种思路的证明方法(要求:只写出辅助线的作法,并画出相应的图形,不需要写出证明过程).
数学课上,老师给出了如下问题:
如图,AD为△ABC中线,点E在AC上,BE交AD于点F,AE=EF.求证:AC=BF.
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859499496112128/2864511396257792/STEM/bae1f77ba8754514be6b0afdd291d6be.png?resizew=173)
经过讨论,同学们得到以下两种思路:
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859499496112128/2864511396257792/STEM/1d2b91ffee28473c8b215d84e6d892ff.png?resizew=302)
![](https://img.xkw.com/dksih/QBM/2021/11/26/2859499496112128/2864511396257792/STEM/7e2df1e3d7d04438a8349806518c7d1c.png?resizew=330)
完成下面问题:
(1) ① 思路一的辅助线的作法是: ;
② 思路二的辅助线的作法是: .
(2)请你给出一种不同于以上两种思路的证明方法(要求:只写出辅助线的作法,并画出相应的图形,不需要写出证明过程).
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【推荐1】如图,AB为⊙O的直径,C为⊙O上一点,连接AC,BC,CD平分∠ACB与⊙O交于另一点D,过点D的直线EF平行于BA,E,F分别是CB,CA与直线EF的交点.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983500997689344/2984420864753664/STEM/1a535e1f4c244c91a0c7bfbd20326fff.png?resizew=253)
(1)求证:EF是⊙O的切线;
(2)若AC=3,BC=
,求BE的长.
![](https://img.xkw.com/dksih/QBM/2022/5/20/2983500997689344/2984420864753664/STEM/1a535e1f4c244c91a0c7bfbd20326fff.png?resizew=253)
(1)求证:EF是⊙O的切线;
(2)若AC=3,BC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
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解答题-作图题
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【推荐2】如图,在
中,
,
平分
交
于点
,
是
上一点,且
经过
,
两点,分别交
,
于点
,
.
(1)使用直尺和圆规,根据题目要求补全图形(尺规作图,保留作图痕迹,不写作法);
(2)求证:
与
相切于点
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c513dca3b8c31bc8d0ed4301e94cc1e5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241465bb8b380fc37d46763241c92e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3182db896bc2462331796e2a6108363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f10681704c4fccfd37664eaf34391dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b79dd200766db27fb90d6bd1992cf658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/764509115979e9958101808383672ec0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/18/bd4deb1e-75f2-484c-bfc8-90deae57e3df.png?resizew=85)
(1)使用直尺和圆规,根据题目要求补全图形(尺规作图,保留作图痕迹,不写作法);
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9ccea461315a9d05aa0193b937d4bfe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1a9c6a736e6eac98a676fa3232db5a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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【推荐2】已知:如图,在
中,
平分
交
于
,点
在
的延长线上,
.
(1)求证:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21fd6087ff96eac9acbd6ee75bb1e46.png)
(2)过点C作
交AE于点F,求证:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38ac49caae8e3b8869d19beeff98966e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/16/baf734a8-ed5c-4f94-96ca-384c6b9bf819.png?resizew=176)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d21fd6087ff96eac9acbd6ee75bb1e46.png)
(2)过点C作
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62d5e4889eecada5e0469c7834ee06ea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c92c4e19fe499b7165753455e82f4285.png)
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