导言:角

The photo above shows a window of a building on the campus of Princeton University in Princeton, New Jersey. A ngles of rotation, arc length, and area of a sector can be used to create such a window. More specifically, what angle should be used to space out the dot design of the window? Will this angle be measured in degrees or radians? What is the length of the arc between certain dots?  In this chapter, we will discuss these types of questions as you learn about angles of rotation, radians, arc length, area sector, and angular speed.   
::以上照片展示了位于新泽西州普林斯顿大学校园的一栋大楼的窗口。 旋转角度、 弧长度和区块可以用来创建这样的窗口。 更具体地说, 窗口点设计应该用什么角度来空间? 这个角度会用度或弧度来衡量吗? 某些点之间的弧长度是多少? 在本章中, 当您了解旋转角度、 弧度、 弧长度、 扇形和角速度时, 我们将讨论这些问题的类型 。