This applet shows how sine, cosine and tangent for an angle A is defined with a unit circle. Use the slider to see to change the angle A. [br]Sin A is the height of the right angle triangle and is represented by the blue segment. [br]Cos A is the base of the right angle triangle and is represented by the red segment. [br]Tan A is the height of the brown segment where E is the intersection between the green ray and the tangent line at B.

1. Answer the following questions:[br]sin 10 degrees, cos 120 degrees, sin 120 degrees, tan120 degrees,[br]cos 230 degrees, sin 230 degrees, tan 230 degrees, [br]cos 350 degrees, sin 350 degrees, tan 350 degrees. [br][br]Compare your answers from the applet with that from a calculator. [br][br]2. Sine A is positive in which quadrants?[br]Cosine A is positive in which quadrants?[br]Tangent A is positive in which quadrants?