外切圆
wài qiē yuán
- Circumscribed circle;externally tangent circle;excircle
外切圆-
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。
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 .