using System;

public class Program

{

    static double CalcSectorArea(double r, int a)

    {

        return (Math.PI*r*r*a)/360;

    }

    public static void Main()

    {

        double r1,r2,r3,r4,r5;

        int a1,a2,a3,a4,a5;

        Console.Write("Radius: ");

        r1=double.Parse(Console.ReadLine());

        Console.Write("Angle: ");

        a1=int.Parse(Console.ReadLine());   

        Console.WriteLine("Sector area: " +(CalcSectorArea(r1, a1)).ToString("F2"));

        Console.Write("Radius: ");

        r2=double.Parse(Console.ReadLine());

        Console.Write("Angle: ");

        a2=int.Parse(Console.ReadLine());

        Console.WriteLine("Sector area: " +(CalcSectorArea(r2, a2)).ToString("F2"));

        Console.Write("Radius: ");

        r3=double.Parse(Console.ReadLine());

        Console.Write("Angle: ");

        a3=int.Parse(Console.ReadLine());

        Console.WriteLine("Sector area: " +(CalcSectorArea(r3, a3)).ToString("F2"));

        Console.Write("Radius: ");

        r4=double.Parse(Console.ReadLine());

        Console.Write("Angle: ");

        a4=int.Parse(Console.ReadLine());

        Console.WriteLine("Sector area: " +(CalcSectorArea(r4, a4)).ToString("F2"));

        Console.Write("Radius: ");

        r5=double.Parse(Console.ReadLine());

        Console.Write("Angle: ");

        a5=int.Parse(Console.ReadLine());

        Console.WriteLine("Sector area: " +(CalcSectorArea(r5, a5)).ToString("F2"));

    }

}