⭕Interactive Unit Circle
Click any of the 16 standard angles, or drag the point freely, to see exact sine, cosine, and tangent values with a reference triangle.
| Exact | Decimal | |
|---|---|---|
| sin θ | 0 | 0.000 |
| cos θ | 1 | 1.000 |
| tan θ | 0 | 0.000 |
Free Interactive Unit Circle
The unit circle is the fastest way to memorize exact trig values — our interactive version lets you click any standard angle to instantly see its exact sine, cosine, and tangent, both as fractions with radicals and as decimals.
Click through all 16 standard angles (multiples of 30° and 45°) around the full circle, or drag the point freely to explore any angle in between, watching the coordinates and trig values update live. A reference right-triangle overlay shows exactly how the coordinates connect to sine and cosine, and quadrant sign indicators make the ASTC rule (All Students Take Calculus) visual instead of memorized.
Switch instantly between degrees and radians, with radians shown as clean π fractions. Whether you're studying for a trig test or just need a quick lookup, it's free, requires no sign-up, and works entirely in your browser. See the About page or the FAQ for more.