如图,在
中,
,以AB上一点O为圆心,OA为半径的圆与BC相切于点C,若
,则⊙
的半径为( )
![](https://img.xkw.com/dksih/QBM/2022/4/17/2967029794693120/2988437574074368/STEM/d8a778a23aa04ce086a40fc46fa9038c.png?resizew=167)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b10134e7a46e6f6f7cb9d5e2371727d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b83cb6327dcbc8a998e6586bcfa7a3b9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/2022/4/17/2967029794693120/2988437574074368/STEM/d8a778a23aa04ce086a40fc46fa9038c.png?resizew=167)
A.4 | B.2 | C.![]() | D.![]() |
更新时间:2022-05-27 14:54:43
|
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【推荐1】如图,正六边形
的边长为
,
是对角线
上一动点,动点
从
点出发且以
的速度在
点和
点间往返匀速平移.过点
作直线
与
垂直,设直线
被正六边形
区域截得的长度为![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
,当点
的运动时间为
时,
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/976260cbf5e30856d4fd37a4b0a671a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b9174c3b1324cf81098e42e0480bcc8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f77b021baddabf9de0d2c85720c913.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
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【推荐2】如图,在Rt
ABC中,∠C=90°,∠A=30°,AB+BC=9cm,则AB的长为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/0111b634-6d43-4b7f-9a1e-643147251e4c.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce4cba95fc7d4853a243f8e3fb20ce70.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/13/0111b634-6d43-4b7f-9a1e-643147251e4c.png?resizew=165)
A.3cm | B.4cm | C.5cm | D.6cm |
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单选题
|
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【推荐1】如图,点
是矩形
的对角线
的中点,
交
于点
,若
,
,则
的长为( )
![](https://img.xkw.com/dksih/QBM/2020/6/22/2490334921637888/2492876394283008/STEM/7165249d-a5f7-435c-80bd-fb7adf003bec.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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A.5 | B.4 | C.![]() | D.![]() |
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【推荐2】将菱形
按如图所示的方式放置,绕原点将菱形
顺时针旋转,每次旋转
,点
的对应点依次为
、
、
、…,若
,
,则
的坐标为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/5/95adb2e7-7ee5-4d5e-a15d-6a79458d2540.png?resizew=126)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3241d7fedd89d85711acd7a2635298af.png)
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A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
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【推荐1】如图,圆心都在x轴正半轴上的半圆
,半圆
,…,半圆
与直线l相切.设半圆
,半圆
,…,圆
的半径分别是
,
,…,rn,
,则当直线l与x轴所成锐角为
,
,且
时,
的值是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be77704255b3cadb7ae2a66ec35205ec.png)
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您最近一年使用:0次
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【推荐2】已知PA,PB是⊙O的切线,A,B是切点,点C是⊙O上不同于点A、点B的一个动点,若∠P=54°,则∠ACB的度数是( )
A.63° | B.117° | C.53°或127° | D.117°或63° |
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名校
【推荐1】如图,梯形ABCD中,AB∥DC,AB⊥BC,AB=2cm,CD=4cm.以BC上一点O为圆心的圆经过A、D两点,且∠AOD=90°,则圆心O到弦AD的距离是( )
![](https://img.xkw.com/dksih/QBM/2015/10/9/1573919618326528/1573919624216576/STEM/3f5f65e297744e7ab4b51a867f026ef2.png?resizew=108)
![](https://img.xkw.com/dksih/QBM/2015/10/9/1573919618326528/1573919624216576/STEM/3f5f65e297744e7ab4b51a867f026ef2.png?resizew=108)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】如图,⊙O是△ABC的外接圆,AB是直径,过点C的切线交AB的延长线于点D,若
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![](https://img.xkw.com/dksih/QBM/2022/5/16/2980625048461312/2983235149021184/STEM/9b6744f3-c135-4188-9ba8-e8523fd3cf51.png?resizew=140)
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A.2cm | B.![]() | C.3cm | D.![]() |
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