public CirclePair([NotNull] ICircle zero,
[NotNull] ICircle one)
{
Distance = Math.Abs(zero.Distance(one));
Zero = CalculatedCircleZero(zero,
one);
One = CalculatedCircleOne(zero,
one);
NumberOfTangents = CalculatedNumberOfTangents(Distance,
Zero.Radius,
One.Radius);
}