The unit circle gives the cosine and sine of every common angle as the (x, y) coordinates of a point on a circle of radius 1. The first coordinate is cos θ, the second is sin θ.
| Angle | Radians | (cos, sin) |
|---|---|---|
| 0° | 0 | (1, 0) |
| 30° | π/6 | (√3/2, 1/2) |
| 45° | π/4 | (√2/2, √2/2) |
| 60° | π/3 | (1/2, √3/2) |
| 90° | π/2 | (0, 1) |
| 120° | 2π/3 | (−1/2, √3/2) |
| 135° | 3π/4 | (−√2/2, √2/2) |
| 150° | 5π/6 | (−√3/2, 1/2) |
| 180° | π | (−1, 0) |
| Angle | Radians | (cos, sin) |
|---|---|---|
| 210° | 7π/6 | (−√3/2, −1/2) |
| 225° | 5π/4 | (−√2/2, −√2/2) |
| 240° | 4π/3 | (−1/2, −√3/2) |
| 270° | 3π/2 | (0, −1) |
| 300° | 5π/3 | (1/2, −√3/2) |
| 315° | 7π/4 | (√2/2, −√2/2) |
| 330° | 11π/6 | (√3/2, −1/2) |
| 360° | 2π | (1, 0) |