class TAMGIAC

    {

        public DIEM A;

        public DIEM B;

        public DIEM C;

        public void NhapTamGiac(string ghiChu)

        {            

            Console.WriteLine(ghiChu);

            A = new DIEM();

            A.NhapDiem("Nhap diem A");

            B = new DIEM();

            B.NhapDiem("Nhap diem B");

            C = new DIEM();

            C.NhapDiem("Nhap diem C");

        }

​

        public double TinhChuVi()

        {

            return A.TinhKC(B) + B.TinhKC(C) + C.TinhKC(A);

        }

    }