1) external common tangent circle
外公切圆
1.
The center and radius of the internal and external common tangent circles of three ones which are externally tangent each other are obtained under the suitable rectangular coordinates system,then the fine relation types between the radiuses are obtained.
在适当的直角坐标系下求出了三个两两相外切圆的内公切圆与外公切圆之圆心坐标和半径,并得到了诸半径之间的优美关系式。
2) common tangent circle
公切圆
1.
We put forward in this article the method of applying common tangent circle drawing to draw 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。
4) OD slicing
外圆切割
5) external cutting
外圆切削
6) circumscribed cylinder
外切圆柱
补充资料：外公
1.外祖父。
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