public void Circle2DAprox()
{
Point2D <double>[] vals = new Point2D <double> [4];
vals[0] = new Point2D <double>(1, 0);
vals[1] = new Point2D <double>(-1, 0);
vals[2] = new Point2D <double>(0, 1);
vals[3] = new Point2D <double>(0, -1);
Circle2D <double> res = new Circle2D <double>(new Point2D <double>(0, 0), 1);
Circle2D <double> apr = Circle2D <double> .Aproximate(vals);
Assert.AreEqual(res.Radius, apr.Radius);
Assert.AreEqual(res.Center.X, apr.Center.X);
Assert.AreEqual(res.Center.Y, apr.Center.Y);
}