Clase Circulo

using System;
using System.Collections.Generic;
using System.Text;

namespace Aplicacion_figuras_geometricas_planas
{
class Circulo
{
double radio;
public Circulo()
{
radio = 0;
}
public Circulo(double rad)
{
radio = rad;
}
public double area()
{
double a;
a = Math.PI * Math.Pow(radio, 2);
return a;
}
public double perimetro()
{
double p;
p = 2 * radio * Math.PI;
return p;
}


}
}