a spherical polygon formed by the arcs of 3 great circles
例句
用作名词 (n.)
The results show that the design method which unifies the stereographic projection and the spherical triangle analytic geometry is one kind of both simple and the quick methods. 研究表明,采用极射赤平投影和球面三角形解析几何相结合的设计计算方法,是一种既简便又快捷的定向钻进轨迹设计方法。