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9-88.
  1. What is the measure in degrees of a central angle measuring radians? Homework Help ✎

    1. What other angles correspond to the same point on the circle?

    2. Make a sketch of the unit circle showing the resulting right triangle.

    3. What are sin, cos and tan exactly?

If you can't remember, calculate.

Now multiply the angle by 7.

420°

The distance around the unit circle is 2π, no matter what point you start from.

The angle you are working with, 420°, is more than 360°. How much more?

Notice that the triangle formed is a 30°-60°-90° triangle.