Radian - Wikipedia
https://en.wikipedia.org/wiki/Radian
The magnitude in radians of one complete revolution (360 degrees) is the length of the entire circumference divided by the radius, or 2πr / r, or 2 π.Thus 2 π radians is equal to 360 degrees, meaning that one radian is equal to 180/ π degrees ≈ 57.29577 95130 82320 876 degrees.. The relation 2π rad = 360° can be derived using the formula for arc length, = (), and by using a …
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