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Radian

The unit radian (rad) is a measure of a plane angle in which one full rotation is 2π radians. Sometimes, the size of an angle is expressed in the unit degree (°).

1° = (π / 180) rad ≈ 0.17 rad
1 rad = (180 / π)° ≈ 57°

Related units
Last modified:22 December 2025 6.40 p.m.
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