what is the circumference of a circle whose central angle is

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/12 15:14:48

what is the circumference of a circle whose central angle is 60.and the radius is 12ft?

2*pi(如果你取3.14的话）*12=circumference of the whole circle(得到整个圆的周长）=75.36ft
然后圆心角(60/360)*75.36=12.56ft,就这么算
再问：可是选项只有： A.14 B.16 C.18 D.20 E.22
再答：不会吧，就是给你半径为12ft的圆，让你求60度角相对圆的周长的呀，就该这么算
再问：好吧。。可能题有问题
再答：恩，有可能吧，我考虑了其它几种可能性，但这些答案里也没有
再问：谢啦
再答：客气，没别人答的话，别忘选我最佳答案亲

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