using System;

   class TAMGIAC

    {

        public DIEM A;

        public DIEM B;

        public DIEM C;

​

        public void Nhap(string ghiChu)

        {

            Console.WriteLine(ghiChu);

            this.A = new DIEM();

            this.B = new DIEM();

            this.C = new DIEM();

​

            this.A.Nhap("Nhap dinh A");

            this.B.Nhap("Nhap dinh B");

            this.C.Nhap("Nhap dinh C");

        }

​

        public double TinhChuVi()

        {

            return this.A.TinhKhoangCach(B) + this.B.TinhKhoangCach(C) + this.C.TinhKhoangCach(A);

        }

​

    }

​

class Program

    {

        static void Main(string[] args)

        {

            TAMGIAC tg;

            tg = new TAMGIAC();

            tg.Nhap("Nhap 3 dinh tam giac");

​

            double kq;

            kq = tg.TinhChuVi();

            Console.WriteLine(kq);

        }

    }