radius
cos θ (x)
sin θ (y)
angle arc
degrees
Angle (degrees)
30°
Angle (radians)
π/6
cos θ (x)
√3/2
sin θ (y)
1/2
tan θ
√3/3
(x, y) = (0.8660, 0.5000)
How it works
Every point on the unit circle is (cos θ, sin θ). The horizontal red leg is the cosine, the vertical green leg is the sine, and tan θ = sin θ / cos θ (undefined where cos θ = 0). Exact values are shown for the 16 common angles — every multiple of 30° and 45°.