public PolarPoint <TRadius, TAngle> ToPolar <TRadius, TAngle>(AngleRange range)
where TRadius : LinearUnit, new()
where TAngle : AngularUnit, new()
{
TRadius radius = new TRadius();
double tempX = this.X.ChangeTo <TRadius>().Value;
double tempY = this.Y.ChangeTo <TRadius>().Value;
radius.Value = Math.Sqrt(tempX * tempX + tempY * tempY);
Radian angle = new Radian(Math.Atan2(tempY, tempX), range); //use tempX and tempY
return(new PolarPoint <TRadius, TAngle>(radius, angle.ChangeTo <TAngle>())); //do not need to cast!
}