Sine and Cosine in a unit circle

This applet will help you see what the sine and cosine are measuring in the unit circle. Anytihng to do with the Sine is red. Anything to do with the Cosine is blue.
To see what the Sine is measuring click the box by "Show the Sine of the angle." To see what the Cosine is measuing clikc the box by "Show the Cosine of the angle."

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QUESTIONS:

(1) What is the sine of 75 degrees?
(2) What is the cosine of 180 degrees?
(3) What is the sine of 250 degrees?
(4) What is the cosine of 120 degrees?

Matthew Patterson, November 10, 2009, Created with GeoGebra