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7-55.

The measure of ∠ROS in ΔROS below is 60°. Homework Help ✎

unit circle

  1. The curved arrow represents the rotation of , beginning from the positive x-axis. Through how many degrees has rotated?

  2. If OR = 1, what are the exact length of OS and SR?

  3. What are the exact coordinates of point R?

Remember that a whole circle is 360°.

Remember the 30°-60°-90° triangle.