angular excess of a small geodesic triangle

例句：

1. 1. The building has a rectangular shape.
   这栋建筑呈矩形形状。
2. 2. The car is designed with an angular front.
   这辆车设计成带有尖角的前脸。
3. 3. The angle of the roof is 45 degrees.
   屋顶的角度是45度。