所以等边三角形的外接圆的面积是内切圆半径的4倍！！
所以等边三角形的外接圆的面积是内切圆面积的4倍！！
1·The roundness of grit's projection was assessed by minimum circumcircle method.
以最小外接圆法评定了金刚石颗粒投影的圆度。
2·An improved algorithm of node refinement scheme called endpoint triangle's circumcircle method (ETCM) is proposed, which has a linear time complexity.
本文提出了一种改进的细分嵌入算法——端点外接圆法(ETCM)，该算法具有线性时间复杂度。