Radian measure connects angle size to arc length. On a unit circle (radius 1), an angle of radians creates an arc length of exactly .
The coordinates of any point on the unit circle are .
Some angles have exact, well-known values. Tap the points on the circle to select them.
Angles can wrap around the circle multiple times, or go backwards (negative angles).
You've successfully mapped the unit circle, mastered exact values, and conquered coterminal angles!