1.Not greatly complicated really; just remember that that the cone's inner and outer angles are specified in radians not degrees.
并不是很复杂。只要记好锥形的内外角是用弧度而不是角度表示的。
4.Many spatial distance algorithms require the Numbers to be in radians, while others can work with degrees.
许多空间距离算法要求采用以弧度表示的数据,而其他算法则要求使用以度表示的数据。