### Home > PC > Chapter 4 > Lesson 4.1.4 > Problem 4-55

4-55.

Study the diagram of the unit circle below right, in which VW

Find

. In a unit circle, what is the radius?

Find

. You have two sides of a right triangle. Find the third side, which is the

-coordinate.*α*is another angle with the same sine as, but a different cosine. What quadrant isin?In Quadrant III, sine and cosine are both negative.

In which quadrant is sine negative and cosine positive?is another angle with the same cosine as, but a different sine. What quadrant isin?In which quadrant is cosine negative and sine positive.