如图,点A、B、C、D均在边长为1的正方形网格的格点上,则sin∠BAC的值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/681fbe5a-716b-4fbc-a610-73a1fb43b9a0.png?resizew=139)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/8/681fbe5a-716b-4fbc-a610-73a1fb43b9a0.png?resizew=139)
A.![]() | B.1 | C.![]() | D.![]() |
更新时间:2020-03-05 18:37:08
|
相似题推荐
单选题
|
适中
(0.65)
【推荐1】如图所示,用构图法可以较简便地计算出
的值,请你仿照这种方法,求出
的值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccefdea6639a9755ed310d0afec2f6cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0846e8e420421c94516b0d5f3eadcfc.png)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
单选题
|
适中
(0.65)
【推荐2】利用量角器可以制作“锐角正弦值速查卡”.制作方法如下:如图,设OA=1,以O为圆心,分别以0.05,0.1,0.15,0.2,…,0.9,0.95长为半径作半圆,再以OA为直径作⊙M.利用“锐角正弦值速查卡”可以读出相应锐角正弦的近似值.例如:
,
.下列角度中正弦值最接近
的是( )
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699586303901696/1700352562298880/STEM/5135b81115134614885f04cdf2df7ed6.png?resizew=280)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b236a160857097e9744e4abacd4af9b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ceba7c6c37b86f9052ac1487506dca4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab9b6383e99c4461db69d6f96a37eb92.png)
![](https://img.xkw.com/dksih/QBM/2017/6/1/1699586303901696/1700352562298880/STEM/5135b81115134614885f04cdf2df7ed6.png?resizew=280)
A.70° | B.50° | C.40° | D.30° |
您最近一年使用:0次