An optimal algorithm for finding the internal common tangent of two simple planar polygons is proposed.

提出了一种确定两简单平面多边形内公切线的最优算法.

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We put forward in this article the method of applying common tangent circle drawing to ellipses.

提出应用公切圆法画椭圆,可不必推平行线和多次加长圆规,只需用直线尺作图,且理论上误差为零.

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