### Home > A2C > Chapter 8 > Lesson 8.1.4 > Problem 8-54

8-54.

The measure of ∠

*ROS*in Δ*ROS*below is 60°. Homework Help ✎The curved arrow represents the rotation of

, beginning from the positive *x*-axis. Through how many degrees hasrotated? If

*OR*= 1, what are the*exact*length of*OS*and*SR*?What are the

*exact*coordinates of point*R*?

Remember that a whole circle is 360°.

Remember the 30°-60°-90° triangle.