### Explanation

One radian is equal to the amount of rotation required to travel one radius along the circumference of the circle, as seen in the image above. A full-rotation or 360° in radians is equal to the value of 2π. A half-rotation or 180° in radians is equal to the value of geometric constant π (pi).

### Notes

To convert radians to degrees, see the DEGREES function. A full-rotation (360°) in radians is equal to 6.283 or 2π A half-rotation (180°) in radians is equal to 3.142 or π (pi).

### Dave Bruns

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