public class Circle implements Figure
{
   private double iRadius;
   public Circle(final double pRadius)
   {
      iRadius = pRadius;
   }
   public double area()
   {
      return Math.PI*iRadius*iRadius;
   }
   public double perimeter()
   {
      return 2.0*Math.PI*iRadius;
   }
   public String toString()
   {
      return "Circle(" + iRadius + ")";
   }
}