20151221210028我等你￣°弧度计算l

        xr，l是弧长，

        是弧l所对的圆心角的弧度数的绝对值，r是底圆半径

        20151221210139我等你￣°角度制计算l

        ÷360x2πr

        πr÷180l是弧长，

        是扇形圆心角，π是圆周率，r是底圆半径

        20151221210615我等你￣°你说的题缺条件

        20151221212446我等你￣°你上qq

        20151221214522我等你￣°你说的那几个知识点，word版我给你发邮箱了

        20151221214522￣°请等我好的

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