### Home > CCA2 > Chapter 7 > Lesson 7.1.4 > Problem 7-55

7-55.

The measure of

The curved arrow represents the rotation of

, beginning from the positive *x*-axis. Through how many degrees hasrotated? Remember that a whole circle is

. If

, what are the*exact*length ofand?Remember the

triangle. What are the

*exact*coordinates of point?