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已有 576 次阅读2012-12-17 21:52

曲率圆：曲率半径r=ds/dα=(1+y'^2)^(3/2)/|y''|

推理记忆：求y=f(x)上一点(x0,y0)的曲率半径r，确定一个圆方程(x-a)^2+(y-b)^2=r^2，满足y(x0)=y0，y'(x0)=f'(x0)，y''(x0)=f''(x0)

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