calculators
Unit Circle Helper
Select common angles on the unit circle to see exact values for sin, cos, and tan. Shows radians and clarifies undefined values.
Frequently Asked Questions
What angles are included?
0°, 30°, 45°, 60°, 90°, 120°, 135°, 150°, 180°, 210°, 225°, 240°, 270°, 300°, 315°, 330°, 360°.
Why is tan sometimes undefined?
Tangent is sin/cos. When cos is 0 (at 90° and 270°), tan is undefined (division by zero).
Are the values exact?
Yes. For common angles, values are shown in exact form like √3/2 or 1/2.