degreeToRadian
Converts an angle from degrees to radians using a pre-calculated conversion factor.
The input degree value must be a finite floating-point number. The conversion factor DEG_TO_RAD_FACTORis (PI / 180.0)cast to a Float`.
Return
The angle converted to radians, as a Float.
Parameters
degree
The angle in degrees.
Throws
IllegalArgumentException
if degree is not a finite number (that is, NaN or Infinity).