### Home > INT3 > Chapter 9 > Lesson 9.1.7 > Problem 9-88

9-88.

What is the measure in degrees of a central angle measuring

radians? Homework Help ✎ What other angles correspond to the same point on the circle?

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

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.