using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Jovan
{
    class povrsina
    {
        public double a;
        public double pk ;
        public double pkruga;
        public double ro;

        public int povrsinasqr(double a) {
            pk = Math.Pow(a,2);
            int pki  = Convert.ToInt32(pk);
            return pki;

        }

        public double povrsinaopkrug(double a) {
            ro = (a * Math.Sqrt(2))/2;
            pkruga = Math.Pow(ro,2) * Math.PI;

            return pkruga;

        }

    }
}