‘Degree’ is one of the units for measuring angles. When rotated one turn, it becomes 360 degrees.
‘Degree’ is the most commonly used unit.


‘Radian’ is the ratio (= l / r) of arc length (l) divided by radius (r).
A half turn is a π(pi), and a turn is 2π(2pi).

In the ‘radian’ system, you can easily calculate the length of the arc by multiplying the angle value by the radius.
Therefore, ‘radian’ is very useful in angle units related to natural phenomena.
The angle unit that the computer basically deals with is also ‘radian’.