Unit Circle Explorer
Drag the angle and watch sine and cosine change. They are just the (x, y) coordinates of the point on the circle.
The circle is the ratio
On a circle of radius 1, the point at angle θ sits at (cos θ, sin θ). Rotate and see.
sin θ
0
cos θ
1
tan θ
0
point (x, y)
(1, 0)
Drag the slider — or snap to a special angle below.
Controls
Challenges
Set the angle, then press Check.