如图,
是
的直径,
是
的切线,连结
,过点
作
交
于点
,延长
,
交于点
.
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506411631050752/2507120402497536/STEM/c91108694da54dcaab3e7fd176b033f7.png?resizew=199)
(1)求证:
是
的切线;
(2)若
,
,求
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/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5a122e25cf4eb9f03ffe5ec823bfc31.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f1df7caed01a23c69b891fb7852f335.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://img.xkw.com/dksih/QBM/2020/7/15/2506411631050752/2507120402497536/STEM/c91108694da54dcaab3e7fd176b033f7.png?resizew=199)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7cbfaec1d9dcaaf159b060163436113.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbb388a36bd5caaa51b7e3c898e3c906.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
更新时间:2020-07-16 14:12:25
|
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解答题-证明题
|
适中
(0.65)
真题
【推荐1】在四边形
中,
的平分线
交
于
,延长
到
使
,
是
的中点,
交
于
,连接
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/fb219fa3-0f21-4558-9b4e-062cffc2c917.png?resizew=400)
(1)当四边形
是矩形时,如图,求证:①
;②
.
(2)当四边形
是平行四边形时,如图,(1)中的结论都成立,请给出结论②的证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2947ca8e0cdbeb4aab80ce9e7b63ba98.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e570eabbf1b9390fe78cbb37995c60f8.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/23/fb219fa3-0f21-4558-9b4e-062cffc2c917.png?resizew=400)
(1)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8245bcd9cf3601f5718d095e1f129c86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83e6138096b5f911b40fc2f7fea3c5ab.png)
(2)当四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解答题-问答题
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适中
(0.65)
【推荐2】已知,如图,
中,
,D是BC上一点,点E、F分别在AB、AC上,
,
,G为EF的中点,问:
与
全等吗?请说明理由.
判断DG与EF的位置关系,并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e428e7a09732be85c1224e9c8f6a71c5.png)
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解答题-问答题
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适中
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【推荐1】如图,已知△ABC中,∠B=45°,AB=4,tanC=2,⊙O过点A、C,交BC边于点D,且
,求CD的长
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解答题-证明题
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真题
名校
【推荐2】课间,小明拿着老师的等腰三角板玩,不小心掉到两墙之间,如图.
(1)求证:△ADC≌△CEB;
(2)从三角板的刻度可知AC=25cm,请你帮小明求出砌墙砖块的厚度a的大小(每块砖的厚度相等).
(1)求证:△ADC≌△CEB;
(2)从三角板的刻度可知AC=25cm,请你帮小明求出砌墙砖块的厚度a的大小(每块砖的厚度相等).
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解答题-证明题
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适中
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【推荐1】如图,
为
的直径,
为
上一点,点C为
的中点,过点C作
,交
的延长线于点D,延长
交
的延长线于点F.
是
的切线;
(2)若
,
,求
的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bb79c82e2ecee4cce178f5e9d79d39e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f951e874c46b9ee8ac55914f0ee5a02.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
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解答题-证明题
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适中
(0.65)
【推荐2】如图,AB为⊙O的直径,O过AC的中点D,DE为⊙O的切线,E在BC上.
(1)求证:DE⊥BC;
(2)如果DE=m,tanC=
,请你写出求AB长的解题思路.
(1)求证:DE⊥BC;
(2)如果DE=m,tanC=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://img.xkw.com/dksih/QBM/2019/6/20/2229513681190912/2230266327351296/STEM/20856ca1dcdc42dd9bf3332bc2f67365.png?resizew=202)
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解答题-问答题
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适中
(0.65)
【推荐1】如图1,在锐角
中,
于点
,
于点
,
、
相交于点
,已知
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/d3bd8925-6a2f-40dd-a293-ff5b6bbac730.png?resizew=344)
(1)判断
与
的数量关系,并说明理由.
(2)若
,求
的长.
(3)如图2,将
沿线段
对折,点
落在
上的点
,
与
相交于点
,当
时,求
的面积.
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e19b77c15bdff64b03a92cac5e7598eb.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/18/d3bd8925-6a2f-40dd-a293-ff5b6bbac730.png?resizew=344)
(1)判断
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274cf35acb4a1748d15c39d15a9bea7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d65639672f444b3d4dc6fc4f357ddbd5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
(3)如图2,将
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d252da5083b76e8aa2572d4ed1a38df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/004104bafb5f30338123d4ea2b7fedde.png)
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解答题-证明题
|
适中
(0.65)
【推荐2】AD是△ABC的中线,将BC边所在直线绕点D顺时针旋转α角,交边AB于点M,交射线AC于点N,设AM=xAB,AN=yAC (x,y≠0).
(1)如图1,当△ABC为等边三角形且α=30°时证明:△AMN∽△DMA;
(2)如图2,证明:
;
(3)当G是AD上任意一点时(点G不与A重合),过点G的直线交边AB于M′,交射线AC于点N′,设AG=nAD,AM′=x′AB,AN′=y′AC(x′,y′≠0),猜想:
是否成立?并说明理由.
(1)如图1,当△ABC为等边三角形且α=30°时证明:△AMN∽△DMA;
(2)如图2,证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3db3fd4869bced363ddf4b50db7689e1.png)
(3)当G是AD上任意一点时(点G不与A重合),过点G的直线交边AB于M′,交射线AC于点N′,设AG=nAD,AM′=x′AB,AN′=y′AC(x′,y′≠0),猜想:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dedca4d46c83e784135f3cf9d7931f3.png)
![](https://img.xkw.com/dksih/QBM/2021/2/26/2666338005835776/2672872887222272/STEM/ec401fe708a844728b1e0ea3bf829df9.png?resizew=612)
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