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Home > A2C > Chapter 8 > Lesson 8.1.7 > Problem 8-104

  1. What central angle, measured in degrees, corresponds to a distance around the unit circle of ? Homework Help ✎

    1. What other angles will take you to the same point on the circle?

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

    3. Find , and exactly. Without using a calculator icon

If you can't remember, calculate.

Now multiply the angle by 7.


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.