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4-55.
  1. Checkpoint icon Study the diagram of the unit circle below right, in which VW = 0.62. Homework Help ✎

    1. Find sin θ.

    2. Find cos θ.

    3. α is another angle with the same sine as θ, but a different cosine. What quadrant is α in?

    4. β is another angle with the same cosine as θ, but a different sine. What quadrant is β in?

In a unit circle, what is the radius?

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

In Quadrant III, sine and cosine are both negative.
In which quadrant is sine negative and cosine positive?

In which quadrant is cosine negative and sine positive.