Unit Circle

Drag the radius around the circle, or use the pencil to type an exact angle and radius or x and y. The legend shows the angle, sin, cos, tan and quadrant; the gear opens the settings (snap, angle unit, legend entries) and the panel button opens the table.

Settings

Legend
Circle
Table columns
Show
Rulers Radian marks:
Graphs (1:1)

Set position

Set by
Calculator & exact values
Saves θ, r, a, b and c into the calculator's memory.

Calculator

Angles in
Memory

Captured on the unit circle and kept in this browser for both calculators. theta, r, a, b, c are the latest capture; m1, m2… are earlier ones (theta1, a1…). Click a name to put it in your expression.

Check a value with a formula

Or type your own formula in the box above.

How to type
  • sqrt(9), √9 or √(16 + 9) is a square root; 2^3 is a power.
  • 2π and 3(4) multiply; pi, π and e work.
  • sin cos tan, asin acos atan, ln log abs, and 5!.
  • ans is your last answer; theta, r, a, b, c and m1, a1… come from memory. Enter keeps a line; click an old line to use it again.

History