**Common Angles on the Unit Circle**

And their cosine/sine values

**3.31** Expand the drawing you created in Problem 3.23 to include the following elements:

I. A unit circle passing through all four quadrants of the coordinate plane

II. The terminal sides of , *π*, , and 2*π* in standard position

II. The coordinates of the points at which the angles intersect the unit circle

Although a unit circle is simply a circle with a radius of 1, the term “unit circle” often refers to the drawing described in this problem. This diagram, duplicated in Appendix ...

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