using System; 

namespace Practical_3

 {

     class CalcArea

     {

         public double Area(double b, double h)

         {

             return (0.5 * b * h);

         }

         public double Area(double r)

         {

             return (3.142 * r * r);

         }

     }

     public class Prac3A

     {

         public static void Main(string[] agrs)

         {

             CalcArea ca = new CalcArea();

             Console.WriteLine("Enter base of the triangle");

             double b = Convert.ToDouble(Console.ReadLine());

             Console.WriteLine("Enter the height of the triangle");

             double h = Convert.ToDouble(Console.ReadLine());

             Console.WriteLine("Area of triangle = " + (ca.Area(b, h))+"\n");

            Console.WriteLine("Enter the radius of the circle");

             double r = Convert.ToDouble(Console.ReadLine());

             Console.WriteLine("Area of Circle = " + (ca.Area(r)));

        }

     }

 }