Solution Review: Implement and Override the Method

// Base Class
class Shape {
  
  public Shape() {} // Default Constructor
  
  // Getter Function
  public virtual double ClacArea() {
    return 0;
  }
  
}
// Derived Class
class Circle : Shape { 
  
  private double _radius;
  
  public Circle(double radius) { // Constructor
    this._radius = radius;
   
  }
  
  // Overridden CalcArea() method which returns the area of Rectangle
  public override double ClacArea() {
    return (this._radius * this._radius) * 3.14;
  }
  
}
class Demo {
  
 public static void Main(string[] args) {
   Shape circle = new Circle(2);
   Console.WriteLine(circle.ClacArea());
  }
  
}