题目内容
(2013•菏泽)在半径为5的圆中,30°的圆心角所对的弧长为 (结果保留π).
【答案】分析:直接利用弧长公式计算即可.
解答:解:L=
=
=
.
点评:主要考查弧长公式L=
.[常见错误]主要错误是部分学生与扇形面积公式S=
混淆,得到
π错误答案,或利用计算得到0.83π或0.833π的答案.
解答:解:L=
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/0.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/1.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/2.png)
点评:主要考查弧长公式L=
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/3.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/4.png)
![](http://thumb.1010pic.com/pic6/res/czsx/web/STSource/201310201204581959399196/SYS201310201204581959399012_DA/5.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
(2013•菏泽)在半径为5的圆中,30°的圆心角所对的弧长为 (结果保留π).