exterior r angle外角
Exterior Opposite Angle Area外部对角映射区
exterior angle cracks外角裂缝
Aussenwinkel exterior angle外角
alternate e exterior angle外错角
alternate exterior angle外错角
exterior angle of a triangle三角形的外角
exterior of a trihedral angle三面角的外部
exterior of simple polyhedral angle简单多面角的外部
N（名词） an angle of a polygon contained between one side extended and the adjacent side 外角