如图,在
中,AD⊥BC于D,下列条件:
①∠B+∠DAC=90°,
②∠B=∠DAC,
③
,
④AB2=BD·BC.
其中一定能够判定
是直角三角形的共有( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/8310770e-732b-4c3f-8068-507f31b147dd.png?resizew=205)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
①∠B+∠DAC=90°,
②∠B=∠DAC,
③
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f5b4aabdd00e840d1f472d19e980848.png)
④AB2=BD·BC.
其中一定能够判定
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/25/8310770e-732b-4c3f-8068-507f31b147dd.png?resizew=205)
A.3个 | B.2个 | C.1个 | D.0个 |
17-18高三·全国·单元测试 查看更多[2]
更新时间:2017-11-13 22:36:48
|
【知识点】 几何证明选讲
相似题推荐
单选题
|
适中
(0.65)
名校
【推荐1】如图,A,B,C,D四点共圆,
,M,N在线段
上,且
,N是
的中点.设
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/9/25/2557559509852160/2557859090259968/STEM/39c85eba02eb4d26ab83802e9d70f231.png?resizew=133)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b116d38556d2d49505b9459b263b74a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4714e33baa77ada39336c475a4be1cbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c884b508394b3ab50734b584d9ec783c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81f156aeaf7093f67f6b0f44cc1e5b60.png)
![](https://img.xkw.com/dksih/QBM/2020/9/25/2557559509852160/2557859090259968/STEM/39c85eba02eb4d26ab83802e9d70f231.png?resizew=133)
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,在△ABC中,∠ACB=90°,BC=12,AC=9,以C为圆心,6为半径的圆上有一动点D,连接AD、BD、CD,则
AD+BD的最小值为( )
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534642385362944/2534827493236736/STEM/d1b0322f5d6e44a7aba3af0932db4c65.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://img.xkw.com/dksih/QBM/2020/8/24/2534642385362944/2534827493236736/STEM/d1b0322f5d6e44a7aba3af0932db4c65.png?resizew=148)
A.3![]() | B.4![]() | C.5![]() | D.6![]() |
您最近一年使用:0次