Trig Functions Defined, Outline

(Click on the blank lines to see how you should fill in the blanks.)

Trigonometry can be thought of in terms of the unit circle.

Recall the equation of a circle: _______________________________________________ where the center is located at (h, k) and the radius is r.

defn: The Unit Circle is the circle with radius of ______ and centered at ____________, so the equation of the unit circle is: ______________________________________ .

We can use the symmetries of the unit circle to find the coordinates of many points when we know one point. Let's find as many points as we can on this circle if the given point is at ( -0.98, _________)

Click on the circle when you are finished.

The basic idea of trig:
Start at the point (1, 0) and move a distance of t counterclockwise then the x-coordinate of the point you land on is called :

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and the y-coordinate of the point you land on is called :

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