text: class Circle{
      _radius;
  
      constructor(radius){
          this._radius = radius;
      }
  
      get diameter() {
          return 2 * this._radius;
      }
  
      get radius() {
          return this._radius;
      }
  
      set diameter(diameter){
          this._radius = diameter / 2;
      }
  
      get area(){
          return Math.PI * this._radius**2;
      }
  }