如图1为某酒店的圆形旋转门,可看成如图2由外围的
和3翼隔风玻璃组成,外围圆有通道
和
,且它们关于圆心
中心对称,圆内的3翼隔风玻璃可绕圆心
转动,且所成的夹角
,3翼隔风玻璃在转动过程中,始终使大厅内外空气隔离,起到对大厅内保温作用.例如:当隔风玻璃转到如图2位置时,大厅内外空气被隔风玻璃
,
隔离.则通道
所对圆心角的度数的最大值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83bb3820bab977db734f4335e4fde720.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aba5f19d313a2cec6b972e0f89e10190.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6cad4595d5352b2884568a59d8d766a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/307bd991211ec79b47a4be52933bb8e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/10/5c1ddba6-6e04-4668-9846-47565ceea94f.png?resizew=192)
A.30° | B.60° | C.90° | D.120° |
更新时间:2023-09-19 09:08:42
|
【知识点】 利用弧、弦、圆心角的关系求解解读
相似题推荐
单选题
|
较易
(0.85)
【推荐1】如图,在
中,弦
和
相交于点E,甲同学说:若
,则
.乙同学说:若
,则
.他们的说法中( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c220eadc312101e2fb89dfe920f7b30d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75582a86b2b09db7221f22c7fcb35362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba11242dcc61d3c7c3555b598b5fdc89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/75582a86b2b09db7221f22c7fcb35362.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/14/3227ff30-352c-40e7-8f6c-ca43548d4060.png?resizew=151)
A.仅甲正确 | B.仅乙正确 |
C.甲、乙都正确 | D.甲、乙都不正确 |
您最近一年使用:0次
单选题
|
较易
(0.85)
【推荐2】已知下列命题:①若
,则
;②平分弦(不是直径)的直径垂直于弦,并且平分弦所对的弧;③对角线互相平分且相等的四边形是菱形,④如果两条弧相等,那么它们所对的圆心角相等;⑤在函数
中,自变量x的取值范围是
且
;⑥若
则
,其中正确命题的个数是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7091d529281abff275ef19b9197445a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73c5df2d299ae14c308b2f00361b60f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5fcdd747923bcc22d9b69dc00c10407.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/629507dcfdeb6866da428c4f45e2b21d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8d09b9fc9719ff6faf32254b9d48713.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/302942f4319f4e7e70ce3d9c6c3cc956.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/94440d3e4c073f94f2b266ff99d50e74.png)
A.4个 | B.3个 | C.2个 | D.1个 |
您最近一年使用:0次