如图,
中,
,
,点
是
的中点,点
是平面内一个动点,
,以点
为直角顶点,
为直角边在
的上方作等腰直角三角形
.当
的度数最大时,
的长为( )
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900660214054912/2902091729133568/STEM/55cf8ed4-b5ac-4944-bfef-2838d1c951c3.png?resizew=191)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://img.xkw.com/dksih/QBM/2022/1/23/2900660214054912/2902091729133568/STEM/55cf8ed4-b5ac-4944-bfef-2838d1c951c3.png?resizew=191)
A.![]() | B.![]() | C.![]() | D.![]() |
21-22九年级上·江苏南通·期末 查看更多[6]
江苏省南通市通州区2021-2022学年九年级上学期期末数学试题(已下线)(安徽卷)2022年中考数学第二次模拟考试(已下线)期末难点特训(三)选填压轴50道-【微专题】2022-2023学年九年级数学下册常考点微专题提分精练(苏科版)江苏省南通市海安市初中教学联盟2023-2024学年九年级上学期12月月考数学试题江苏省南通市通州区2023-2024学年九年级上学期期末数学试题(已下线)专题09圆的有关位置关系及计算1(十大类型)-【好题汇编】备战2023-2024学年九年级数学上学期期末真题分类汇编(苏科版)
更新时间:2022-01-25 15:03:38
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【推荐1】如图,将含有30°角的直角三角板OAB按如图所示的方式放置在平面直角坐标系中,OB在x轴上,若OA=4,将三角板绕原点O逆时针旋转,每秒旋转45°,则第2022秒时,点A的对应点A′的坐标为( ).
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【推荐2】如图,在矩形
中,
是边
上一动点,
是对角线
上一动点,且
,则
的最小值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e02e2b65047be5749c22ac0f207af607.png)
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【推荐1】如果两个圆相交,且其中一个圆的圆心在另一个圆的圆内时,我们称此两圆的位置关系为“内相交”.如图1,已知△ABC中,∠C=90°,AC=4,BC=3,点O在边AC上.如果⊙C与直线AB相切,以OA为半径的⊙O与⊙C“内相交”,那么OA的长度可以是( )
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【推荐2】如图,在
中,
,
,
,D是
上一动点,
于E,
交
于点F,则
的最大值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
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【推荐1】如图,AD是⊙O的直径,以A为圆心,弦AB为半径画弧交⊙O于点C,连结BC交AD于点E,若DE=3,BC=8,则⊙O的半径长为( )
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【推荐2】如图,在
中,
为斜边
上任一点,作经过点C,且与边
相切于点D的
.对于结论Ⅰ和Ⅱ,下列判断正确的是()
结论Ⅰ:若
的圆心O落在边
上,则
的半径为
;
结论Ⅱ:当
与直线
有另一交点E,与直线
交于另一点F时,点E,F之间的最小距离为
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
结论Ⅰ:若
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结论Ⅱ:当
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A.Ⅰ和Ⅱ都对 | B.Ⅰ和Ⅱ都不对 | C.Ⅰ不对Ⅱ对 | D.Ⅰ对Ⅱ不对 |
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