What is the measure in degrees of a central angle measuring
If you can't remember, calculate.
Now multiply the angle by
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.
Make a sketch of the unit circle showing the resulting right triangle.
The angle you are working with,
, is more than . How much more?
What are sin
, cos and tan exactly?
Notice that the triangle formed is a