已知扇形
的面积为
,圆心角为
,则该扇形的弧长为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/274a77343ecde1c2665df291761b6563.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ff5bb943e2d1bf24e53e81739a891a0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd4c5016bd1fc6582078299b9cf8b392.png)
更新时间:2023-12-30 17:45:21
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【推荐1】一个扇形的面积是
,它的周长是
,则圆心角为______ 弧度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/168487ff53e9fb74f786a7e6e78823e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/095ab4a92bf822e175d370e6d0c8a730.png)
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【推荐2】已知圆锥的母线为3,侧面展开图是圆心角为
的扇形,则此圆锥的体积为_______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4966e5af166b69a0a38a98abf555b6b.png)
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【推荐1】给出下列命题:
①半径为2,圆心角的弧度数为
的扇形面积为
;
②若α、β为锐角,tan(α+β)
,tan β
,则α+2β
;
③函数y=cos(2x
)的一条对称轴是x
;
④
是函数y=sin(2x+
)为偶函数的一个充分不必要条件.
其中真命题的序号是____________
①半径为2,圆心角的弧度数为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8eff998d034284391ca064755fa6bf1b.png)
②若α、β为锐角,tan(α+β)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52c70c0c5a061195b9941796b6a9acc4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/34efd0021d06e31448496f3673eb2a45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a3e888051ee02f3e07647c93dc380f.png)
③函数y=cos(2x
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4eaa60bbd4c9040b7194492fc661f83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ea978f66e6b13f45dc498acf0626e07.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bc698b6d2901fc82c1a7c15966f798d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7509459e5f133e81c026c4943be51db0.png)
其中真命题的序号是
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【推荐2】若圆心角为
的扇形的弧长为
,则该扇形面积为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0211da37e92f915e781691296578ba0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70f5389990c3a0c5373f3bd9fb2454c9.png)
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