public void ArcLength()
{
double radius = 50;
double angle = 50;
Assert.Equal(43.633231299858238, CircleHelper.ArcLength(radius, angle));
}
public void ArcLengthRound12()
{
double radius = 50;
double angle = 50;
Assert.Equal(43.633231299858, System.Math.Round(CircleHelper.ArcLength(radius, angle), 12));
}