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This global floating-point constant approximates twice the value of Pi.
See Also:
IlcArcCos, IlcArcSin, IlcArcTan, IlcCos, IlcDegToRad, IlcHalfPi, IlcQuarterPi, IlcPi, IlcRadToDeg, IlcSin, IlcTan, IlcThreeHalfPi