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题目答案
$\frac {2\pi R}{360}$$\frac {\pi R}{180}$$\frac {n}{360}·2 \pi R$$\frac {n\pi R}{180}$$n= \frac {180l}{\pi R}$
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["$\\frac {2\\pi R}{360}$","$\\frac {\\pi R}{180}$","$\\frac {n}{360}·2 \\pi R$","$\\frac {n\\pi R}{180}$","$n= \\frac {180l}{\\pi R}$"]