static void Main(string[] args)
{
Console.WriteLine("Area and circumference of circle");
Console.WriteLine("********************************");
Circle circle = new Circle();
Console.Write("Enter the radius of the circle: ");
string r = Console.ReadLine();
double radius = double.Parse(r);
Console.WriteLine("----------------------------------" + "\n");
double circumference = circle.Circumference(radius);
Console.Write("The circumference of the circle is: " + circumference.ToString("F"));
Console.WriteLine();
Console.WriteLine("The area of the circle is: " + circle.CircleArea(radius).ToString("F"));
Console.ReadKey();
Console.WriteLine("----------------------------------" + "\n");
Console.WriteLine("Area of triangle");
Console.WriteLine("****************");
Triangle triangle = new Triangle();
Console.Write("Enter the lenght of side A: ");
string a = Console.ReadLine();
int SideA = int.Parse(a);
Console.Write("Enter the lenght of side B: ");
string b = Console.ReadLine();
int SideB = int.Parse(b);
Console.Write("Enter the lenght of side C: ");
string c = Console.ReadLine();
int SideC = int.Parse(c);
Console.WriteLine("----------------------------------" + "\n");
Console.Write("The area of the triangle is: " + triangle.HeronFormula(SideA, SideB, SideC).ToString("F"));
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("----------------------------------" + "\n");
Console.WriteLine("Solving a quadratic equation");
Console.WriteLine("*****************************");
Quadratic quadratic = new Quadratic();
Console.Write("Enter A value: ");
string ax = Console.ReadLine();
int A = int.Parse(ax);
Console.Write("Enter B value: ");
string bx = Console.ReadLine();
int B = int.Parse(bx);
Console.Write("Enter C value: ");
string cx = Console.ReadLine();
int C = int.Parse(cx);
Console.WriteLine("----------------------------------" + "\n");
Console.Write("The result of the equation are: " + quadratic.QuadraticX1(A, B, C).ToString("F") + " and " + quadratic.QuadraticX2(A, B, C).ToString("F"));
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("----------------------------------" + "\n");
Console.WriteLine("Volume of hemisphere");
Console.WriteLine("********************");
Hemisphere hemisphere = new Hemisphere();
Console.Write("Enter the radius: ");
string R = Console.ReadLine();
double HemisphereRaduis = double.Parse(R);
Console.WriteLine("----------------------------------" + "\n");
Console.Write("The area of the triangle is: " + hemisphere.HemisphereVolume(HemisphereRaduis).ToString("F"));
Console.WriteLine();
Console.ReadKey();
Console.WriteLine("----------------------------------" + "\n");
}