using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace ConsoleApplication1
{
class Program
{
static void Main(string[] args)
{
double pi = 3.14;
double r = 5;
double S = pi * r * r;
double Perimeter = pi * r * 2;
Console.WriteLine("圆的面积是{0}圆的周长是{1}", S,Perimeter );
Console.ReadKey();
}
}
}
