如图,在等腰三角形△ABC中,O为底边BC的中点,以O为圆心作半圆与AB,AC相切,切点分别为D,E.过半圆上一点F作半圆的切线,分别交AB,AC于M,N.那么
的值等于( )
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448147104030720/2448288482557952/STEM/4e5acb0b23734b1298c0bf268e3a6232.png?resizew=83)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2cf22c961d2e7d016d2aa4dd16422d9.png)
![](https://img.xkw.com/dksih/QBM/2020/4/24/2448147104030720/2448288482557952/STEM/4e5acb0b23734b1298c0bf268e3a6232.png?resizew=83)
A.![]() | B.![]() | C.![]() | D.1 |
更新时间:2020-04-24 11:18:34
|
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图,一般
中
,
是
边上的点,先将
沿着
翻折,翻折后
的
边交
于点
,又将
沿着
翻折,
点恰好落在
上,此时
,则原三角形的
( )度.
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442706956861440/2442924032327680/STEM/37ad135610b74d6080957830a3a5a695.png?resizew=365)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0faed94a64b2dcfc6801b4fca0f16675.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f3018c687427b6257767eda4a8c6612.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc3814287dbb60d478bffc5366f9928b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7df6d51738ac1bc8b9530ea4a55745c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85c4bdfb0db1e31e8459df1d15f9ab55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b3bb63178f528fa45457b841b43eee6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/afde09d82ae96f00c135732baee64776.png)
![](https://img.xkw.com/dksih/QBM/2020/4/16/2442706956861440/2442924032327680/STEM/37ad135610b74d6080957830a3a5a695.png?resizew=365)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】已知如图:△ABC中,AB=AC,BE=CD,BD=CF,则∠EDF=( )
![](https://img.xkw.com/dksih/QBM/2019/3/12/2158912381100032/2160459149942784/STEM/17104cccda724fe69474e50c46e52731.png?resizew=114)
![](https://img.xkw.com/dksih/QBM/2019/3/12/2158912381100032/2160459149942784/STEM/17104cccda724fe69474e50c46e52731.png?resizew=114)
A.2∠A | B.90°﹣2∠A | C.90°﹣∠A | D.90°﹣![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】下列命题是真命题的是( )
A.六边形内角是540° | B.三角形的内心是三边的垂直平分线的交点 |
C.同位角相等 | D.过不在同一直线上的三点可以确定一个圆 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图,PA、PB分别是⊙O的切线,A、B为切点,AC是⊙O的直径,已知∠BAC=35°,∠P的度数为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/b26d82ef-e270-4f49-9fd6-c7127c5bb2bd.png?resizew=164)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/b26d82ef-e270-4f49-9fd6-c7127c5bb2bd.png?resizew=164)
A.35° | B.45° | C.65° | D.70° |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】如图,∠ACB=60○,半径为1的⊙O切BC于点C,若将⊙O在直线CB上沿某一方向滚动,当滚动到⊙O与CA也相切时,圆心O移动的水平距离为( )
![](https://img.xkw.com/dksih/QBM/2021/12/25/2880056947507200/2880376191246336/STEM/2c1a0fa8-b93f-4d0e-9487-5fcc566b8585.png?resizew=173)
![](https://img.xkw.com/dksih/QBM/2021/12/25/2880056947507200/2880376191246336/STEM/2c1a0fa8-b93f-4d0e-9487-5fcc566b8585.png?resizew=173)
A.![]() | B.![]() | C.π 或![]() | D.![]() ![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
名校
【推荐2】如图,
是
的切线,切点分别是
.若
,则
的长是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ddc3ba93-5308-4a66-9519-5369b3756a97.png?resizew=162)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fbc9828bc358f80ff0c4004d9c6b8aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8650921379f4c4f54f51b581002c579b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52bf437bceed5c60fd96c06f24fcc6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/9/ddc3ba93-5308-4a66-9519-5369b3756a97.png?resizew=162)
A.2 | B.4 | C.6 | D.8 |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐1】如图,△ABC中,AB=AC=10,BC=12,动点P从A点出发,按A→B的方向在AB上移动,动点Q从B点出发,按B→C的方向在BC上移动(当P点到达点B时,P点和Q点停止移动,且两点的移动速度相等),记PA=x,△BPQ的面积为y,则y关于x的函数图像大致是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/cadefb90-e187-4b6b-8d24-4ccfa4bd1ac0.png?resizew=145)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/8/31/cadefb90-e187-4b6b-8d24-4ccfa4bd1ac0.png?resizew=145)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】如图1,小明在路灯下笔直的向远离路灯方向行走,将其抽象成如图2所示的几何图形.已知路灯灯泡距地面的距离AB等于4米,小明CD身高1.5米,小明距离路灯灯泡的正下方距离BC等于4米,当小明走到E点时,发现影子长度增加2米,则小明走过的距离CE等于( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/0d87cc19-ce3e-4c3a-af1f-d67f11714dd5.png?resizew=345)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/10/0d87cc19-ce3e-4c3a-af1f-d67f11714dd5.png?resizew=345)
A.在3和4之间 | B.在4和5之间 | C.在5和6之间 | D.在6和7之间 |
您最近一年使用:0次