Calculate the area of a circle, rectangle, triangle

Class Progarm

{

static void Main (string[] argm)

{

Console.WriteLine ("Select to shape (enter the graphics serial number)");

Console.WriteLine ("1, Circle, 2, Rectangle, 3, triangle);

String str = Console.ReadLine ();

Switch (STR)

{

Case "1":

Console.WriteLine ("Please enter the radius of the Circle:");

int r = Int. Parse (Console.ReadLine ());

int YS = MG (R);

Console.WriteLine ("Round Area ={0}", YS);

Break

Case "2":

Console.WriteLine ("Please enter the length of the rectangle:");

int c = Int. Parse (Console.ReadLine ());

Console.WriteLine ("Please enter the width of the rectangle:");

int k = Int. Parse (Console.ReadLine ());

int JS = MG (c, k);

Console.WriteLine ("Area of Rectangle ={0}", JS);

Break

Case "3":

Console.WriteLine ("Please enter the base length of the triangle:");

int d = Int. Parse (Console.ReadLine ());

Console.WriteLine ("Please enter the height of the triangle:");

int g = Int. Parse (Console.ReadLine ());

int x = 2;

int SS = MG (d, G, X);

Comsole.writeline ("Area of Triangle ={0}", SS);

Break

}

}

static int MG (int r)

{

return Math.PI * R * r;

}

static int MG (int chang, int kuan)

{

Return Chang * KUAN;

}

static int MG (int di, int gao, int x)

{

return di * gao/x;

}

}

Calculate the area of a circle, rectangle, triangle