在直角坐标系中,已知圆
的圆心坐标为
,半径为5,点
和点
是圆
上两个不同的点,其中
与均不为0.过点
分别作圆
的切线
与
轴和
分别相交于
两点,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0be7f02afbf4aaa10f0c63cf443b65.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3c47d128bcf2d0502b854724b6b6746.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b569572c8d9bf05d78d3ab741e68bb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d6f5adf13b4214666292dd64b947741.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb9e7513df6afb8307a8beb7e1dec194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ce7ae90d808f05e86ea063238e4b2f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b2f549cdd4a133003cda2ac60022c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b28c01b603a693c8a05dc11bdfbcfb7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f6f17bc385bafb37e8f964e5eb99cd0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e52586ca2a3b783bc8092415e2d4bf6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0be7f02afbf4aaa10f0c63cf443b65.png)
更新时间:2020-07-17 07:53:45
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【推荐1】如图,在每个小正方形的边长为1的网格中,每个小正方形的顶点叫做格点.圆上的点A,B,C均为格点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/efb76c21-f20a-4836-a3c1-1eca09a8cd3f.png?resizew=176)
(1)圆的直径长为_________ ;
(2)请用无刻度的直尺,在如图所示的网格中,确定格点E,使
为圆的一条切线,并画出过点E的另一条切线
,切点为F,请简要说明切线
的位置是如何找到的(不要求证明)._________________ .
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/14/efb76c21-f20a-4836-a3c1-1eca09a8cd3f.png?resizew=176)
(1)圆的直径长为
(2)请用无刻度的直尺,在如图所示的网格中,确定格点E,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1642eec556eb252de9c1ab7bb5ca90b3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
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【推荐2】如图,
中,
,点
在
上,
,连接
,以
为直径作
,分别与
,
交于点
,
,点
为
的中点,连接
,过点
作
的切线
,交
于点
,则
的长为____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07140f277a35733d8c97577ccdd4e3ab.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/432cce1481829c4dfe2bd557f6e9aa4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.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/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](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/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63e36329f5e0979f5ee776ac5d06327.png)
![](https://img.xkw.com/dksih/QBM/2019/11/29/2344270994939904/2345289168117760/STEM/f4aae7952d844c2ab541e9ae2155deb8.png?resizew=220)
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【推荐1】如图,在平面直角坐标系
中.边长为3的等边
的边
在x轴上,C、D、E分别是
上的动点,且满足
,连接
,当点E坐标为______ 时,
与
相似.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee31829d0d4d5f779a957d7df8058ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fe95f656b98b53f71a9d72bf0c9a4b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f155c9ad94cadfa988a540c82322534c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/378791a4bab2563f9f002a6620d38815.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1f908b267576344b0067285584762d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d631f45bc652539853f236952afa5bbf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dcb49df05f2e31d005735c3f14a21d30.png)
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【推荐2】如图,△ABC内接于⊙O,BD⊥AC于点E,连接AD,OF⊥AD于点F,∠D=45° .若OF=2,则BE的长为___________________ .
![](https://img.xkw.com/dksih/QBM/2020/7/6/2500183873716224/2501465206972416/STEM/9ccae45b31484385b9db4e24f84702b7.png?resizew=159)
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