public static bool ApproximateEquals(this Circle2d a, Circle2d b, double tolerance) => ApproximateEquals(a.Center, b.Center, tolerance) && ApproximateEquals(a.Radius, b.Radius, tolerance);
public static bool ApproximateEquals(this Circle2d a, Circle2d b) => ApproximateEquals(a, b, Constant <double> .PositiveTinyValue);
public bool Equals(Circle2d other) => Center.Equals(other.Center) && Radius.Equals(other.Radius);