基于球面三角与三棱锥关联的球面三角图解法

Spherical Triangle Graphic Methods Based on the Relation of Spherical Triangle and Triangular Pyramid

用新的视角，通过讨论球面三角与三棱锥的关联找出用画法几何在平面上图解球面三角问题的方法。

In this paper the relation of spherical triangle with triangalar pyramid is expounded.At this new viewpoint the graphic method to solute spherical triangle problems by descriptive geometry is found .