Long description: Trig6Fig12
Alt text: The image displays three diagrams illustrating the cosine and sine functions on the unit circle at angles of 90 degrees, between 90 and 180 degrees, and at 180 degrees.
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- The first diagram shows the unit circle with an angle \text{theta} (\(\theta\)) at 90 degrees, indicating that the cosine is 0 and the sine is 1.
- The second diagram illustrates the unit circle for angles between 90 and 180 degrees, showing that the cosine is negative (represented by the length \text{OQ}) and the sine is positive (represented by the length \text{OR}).
- The third diagram shows the unit circle at 180 degrees, indicating that the cosine is -1 and the sine is 0.