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9-88.

What is the measure in degrees of a central angle measuring radians? Homework Help ✎

If you can't remember, calculate.

Now multiply the angle by .

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

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

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

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

    answer b unit circle

  3. What are sin, cos and tan exactly?

    Notice that the triangle formed is a triangle.