We then did a "layered approach" We looked at different triangles on geogebra. Let's pick an easy number for the radius. How about 1? Instantly the unit circle appeared. Let's look at the (x,y) coordinate of that point C; but we need axises- Whola - they appear. I then put up a point that represent the angle vs. the sine of the angle. How does this point relate (as I move the slider bar). We then talked about the graph of y=sin(x), y=cosine(x) etc.
see. http://eduflection.blog.com/2014/01/10/trigonometry-intro-triangle-finger-prints/
