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Home > A2C > Chapter 8 > Lesson 8.1.4 > Problem 8-64


Sketch a unit circle. In your circle, sketch in an angle that has:   

  1. A positive cosine and a negative sine.

  2. A sine of .

  3. A negative cosine and a negative sine.

  4. A cosine of about and a sine of about .

  5. Could an angle have a sine equal to and cosine equal to ? Give an angle or explain why not.

Use the eTool below to explore these ideas.
Click the link at right for the full version of the eTool:  8-64 HW eTool