360 degrees = ~6.283 rad
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A radian is an arc of the circumference of a circle and it is about 57.3 degrees.
k radians = k*180/pi degrees. If the result is less than 0 degrees or greater than 360 degrees, then you can usually add or subtract 360 degrees as many times as you like so as to bring the answer into the required interval.
290 degrees = 290*tau/360 degrees (exactly) or 5.06 radians, approx.
n degrees = n*tau/360 or n*pi/180 radians.
A radian is 180/pi degrees, or about 57 degrees