According to convention we use always Radian in games. Degree is 1/360 part of one complete revolution.
Radian :In a circle when length of arc is equal to the radius, then angle subtended at the center by arc is called radian. Here arc is
part of curved length along circle.
pi = 3.14159265358979323846264338327950288… approximately.
Conversion between Radian and Degree.
Radian to Degree
pi radian = 180 degree.
x radian = (180/pi)*x degree.
Degree to radian
180 degree = pi radian.
x degree = (pi/180)* radian.
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