public void DistanceFromWorks(CartesianPoint p, CartesianPoint q, double distance)
{
Assert.AreEqual(distance, p.DistanceFrom(q));
Assert.AreEqual(distance, q.DistanceFrom(p));
Assert.AreEqual(distance, CartesianPoint.DistanceBetween(p, q));
Assert.AreEqual(distance, CartesianPoint.DistanceBetween(q, p));
}
