现在�们可以从小圆的圆心点�大圆偏置后的圆画切线,然后�外偏置小圆的半径,就成了最开始两圆的外公切线,如下图: Template




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tomski现在�们可以从小圆的圆心点�大圆偏置后的圆画切线,然后�外偏置小圆的半径,就成了最开始两圆的外公切线,如下图: coloring