Trigonometry Circle
Interactive simulation — adjust parameters and watch the visualization update in real time.
How it works
On the unit circle, cos θ is the x-coordinate and sin θ is the y-coordinate of the point at angle θ from the positive x-axis. The diagram shows a circle of radius R in pixels; ratios match the unit circle.
Key equations
cos θ = x, sin θ = y, tan θ = sin θ / cos θ