Unit Descriptions

1 Revolution (or cycle, full circle, turn, rotation) is equal to exactly 360° (degrees of arc) or 2π radians (SI unit) or 400 gradians or 4 right angles.

1 Radian:1 Radian is defined as the angle subtended at the center of a circle by an arc whose length is equal to the circle's radius. One full turn is 2π radians.