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.
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.