Unit Circle Investigation
The goal of this activity is to determine what the ordered pair (a, b) measures in a unit circle (a circle with a radius of one).
1) Click the animate arrow.
2) Click the Triangle box.
3) Use the triangle to determine what a represents and what b represents. Pause the animation if necessary.
4) Click the "sin x=" and "cos x =" boxes to check your understanding.
5) How could you determine tan x from the ordered pair (a, b)? Check you understanding by clicking the
"tan x =" box
6) Is there a limit to the size or direction of the rotation (x or input)?
7) Is there a limit to the sine or cosine ratios (output)?