using System;

namespace ConsoleApp2
{

    public class Circle
    {
        private int radius;
        public Circle()
        {
            radius = 10;
        }
        public Circle(int initialRadius)
        {
            radius = initialRadius;
        }
        public double Area()
        {
            return Math.PI * radius * radius;
        }
        Circle MyCircle = new Circle(12);
        double area = MyCircle.Area();

    }



}