如图,⊙O是△ABC的外接圆,AB=5,BC=8,sinB=
.
(1)求边AC的长;
(2)求⊙O的半径长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
(1)求边AC的长;
(2)求⊙O的半径长.
![](https://img.xkw.com/dksih/QBM/2021/5/2/2712444955746304/2714658149761024/STEM/31ff1bf6880048a5bc93281f2d272381.png?resizew=209)
2021·上海崇明·二模 查看更多[3]
2021年上海市崇明区中考数学二模试题(已下线)2021-2022学年沪科版九年级数学上册专题15 圆的相关概念和性质(专题强化-提高)(已下线)第08讲 垂径定理 (2大考点)-2022-2023学年九年级数学考试满分全攻略(沪教版)
更新时间:2021-05-05 19:29:03
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相似题推荐
解答题-证明题
|
适中
(0.65)
【推荐1】如图,
为
外接圆⊙O的直径,
交
于点F,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/2f8248a6-7943-4d36-afce-611a38e085e6.png?resizew=131)
(1)求证:
是⊙O的切线;
(2)求证:
;
(3)若
,
,
,求⊙O的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bad5e80406fa9f366098b25a89d78f59.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/7/2f8248a6-7943-4d36-afce-611a38e085e6.png?resizew=131)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05e4b61eab97bc9f5d45989e7c52e64e.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e932b4add3175358f15be0e1f7104e79.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04725e51b4870658f74de79403e3898f.png)
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解答题-作图题
|
适中
(0.65)
【推荐2】如图,在
中,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/6d639901-fac4-4da3-b53a-ef9153c3ed4d.png?resizew=155)
(1)
的外接圆半径为 ;
(2)用直尺和圆规作出
的内切圆(保留作图痕迹,不写作法),并求出
的内切圆半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb01c6fad0ba4fd53c335cf803a2d58a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/28/6d639901-fac4-4da3-b53a-ef9153c3ed4d.png?resizew=155)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
(2)用直尺和圆规作出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c65edad25ddd666cdce0d7e5afefc9.png)
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解答题-问答题
|
适中
(0.65)
【推荐1】如图,
为等边三角形,D为平面内任意一点,连接
.
边上时,将
绕点A逆时针旋转
得到
,连接
,
,直接写出
与
的数量关系为__________;直线
与
所夹锐角为__________度.
(2)如图2,D为
外一点,将
绕点A逆时针旋转
得到
,连接
,取
,
的中点M,N,连接
,试问:
的值是否随图形的旋转而变化?若不变,请求出该值;若变化,请说明理由.
(3)如图3,D在
边上时,将
绕点A逆时针旋转
得到
,连接
交
于F,G为
边的中点,连接
,猜想
与
存在的关系,并证明你的猜想.
![](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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4eedae8d316c76e3d0b451256de03fb9.png)
(2)如图2,D为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88929f4ba0851730d5f941d426b87548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2044b01c3e9f0bdece72ad17bdfd886d.png)
(3)如图3,D在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
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解答题-问答题
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适中
(0.65)
【推荐2】如图,在平面直角坐标系系中,一次函数
与反比例函数
的图象交于第二、第四象限
,
两点,过点
作
轴,垂足为
,
,
,且点
的坐标为
.
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189214745575424/2189463658610688/STEM/aabd501f51364ecda7bb33c21a61089c.png?resizew=228)
(1)求一次函数与反比例函数的表达式;
(2)将一次函数
向下移动
个单位的函数记为
,当
时,求
的取值范围.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98bd749faa31a3d813a575fb00f0da8f.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1ca872f51e4e6835e99067b31b53cc3.png)
![](https://img.xkw.com/dksih/QBM/2019/4/24/2189214745575424/2189463658610688/STEM/aabd501f51364ecda7bb33c21a61089c.png?resizew=228)
(1)求一次函数与反比例函数的表达式;
(2)将一次函数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98bd749faa31a3d813a575fb00f0da8f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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