What is a reference circle?
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What are a unit circle and its reference angles?
Draw a circle and shade one-third of it. What fraction of the circle is not shaded? What percent of the circle is not shaded?
a. The unit circle is the circle centered at ______ with radius _______.
b. The equation of the unit circle is ___________.
c. Suppose the point is on the unit circle. What are the missing coordinates given,