static void Main(string[] args)
{
Circle c1 = new Circle(-1);
c1.SetRadius(2.0);
Circle c2 = new Circle();
c2.SetRadius(3);
Circle c3 = new Circle();
c3.SetRadius(0);
Rectangle r1 = new Rectangle(-1, -2);
r1.SetLength(2.0);
r1.SetWidth(-0.1);
Rectangle r2 = new Rectangle();
r2.SetLength(3);
r2.SetLength(-2);
Rectangle r3 = new Rectangle();
r3.SetLength(0);
r3.SetWidth(0);
Square s1 = new Square(-1);
s1.SetSide(2.0);
Square s2 = new Square();
s2.SetSide(3);
Square s3 = new Square();
s3.SetSide(0);
Triangle t1 = new Triangle(0, 1, 2);
t1.SetSideA(2.0);
t1.SetSideB(0);
t1.SetSideC(-0.2);
Triangle t2 = new Triangle(-1, 0, 1);
t1.SetSideA(12);
t1.SetSideB(-0);
t1.SetSideC(-21);
Triangle t3 = new Triangle(-0, 0, 1);
t1.SetSideA(0.0);
t1.SetSideB(0.1);
t1.SetSideC(-0.2);
}