Trigonometry Reference
Unit Circle Values Reference
Review common degree and radian angles with sine, cosine, and tangent values. The unit circle connects angle measure to the coordinate pair where cosine is x and sine is y.
Reference table
8 angles
Common first-quadrant and axis angles for fast classroom review.
Unit Circle Table
Common degree, radian, sine, cosine, and tangent values
| Degrees | Radians | cos(theta) | sin(theta) | tan(theta) |
|---|---|---|---|---|
| 0 deg | 0 | 1 | 0 | 0 |
| 30 deg | pi/6 | sqrt(3)/2 | 1/2 | sqrt(3)/3 |
| 45 deg | pi/4 | sqrt(2)/2 | sqrt(2)/2 | 1 |
| 60 deg | pi/3 | 1/2 | sqrt(3)/2 | sqrt(3) |
| 90 deg | pi/2 | 0 | 1 | undefined |
| 180 deg | pi | -1 | 0 | 0 |
| 270 deg | 3pi/2 | 0 | -1 | undefined |
| 360 deg | 2pi | 1 | 0 | 0 |
How To Read It
Cosine is x, sine is y
On the unit circle, each angle points to a coordinate pair on a circle with radius 1. The x-coordinate is cosine and the y-coordinate is sine. Tangent is sine divided by cosine, so tangent is undefined when cosine equals zero.
Degree values are often easier to visualize, while radian values connect directly to arc length and advanced trigonometry. Use the converter when you need the same angle in both systems.