public static double TinhChuVi(TAMGIAC tg)
{
double a, b, c;
a = XL_DIEM.TinhKhoangCach(tg.A, tg.B);
b = XL_DIEM.TinhKhoangCach(tg.B, tg.C);
c = XL_DIEM.TinhKhoangCach(tg.C, tg.A);
return(a + b + c);
}
public static TAMGIAC NhapTamGiac()
{
TAMGIAC tg;
Console.WriteLine("Nhap dinh A:");
tg.A = XL_DIEM.NhapDiem();
Console.WriteLine("Nhap dinh B:");
tg.B = XL_DIEM.NhapDiem();
Console.WriteLine("Nhap dinh C:");
tg.C = XL_DIEM.NhapDiem();
return(tg);
}
public static double TinhChuVi(DAGIAC dg)
{
double chuVi = 0;
int N = dg.dsDinh.Length;
for (int i = 0; i < N - 1; i++) //khong tinh dinh cuoi cuoi
{
chuVi = chuVi + XL_DIEM.TinhKhoangCach(dg.dsDinh[i], dg.dsDinh[i + 1]);
}
//Khoang cach giua dinh dau tien va dinh cuoi cung
chuVi = chuVi + XL_DIEM.TinhKhoangCach(dg.dsDinh[0], dg.dsDinh[N - 1]);
return(chuVi);
}
public static DAGIAC NhapDaGiac()
{
DAGIAC dg;
Console.WriteLine("Nhap so dinh cua da giac");
int N = int.Parse(Console.ReadLine());
dg.dsDinh = new DIEM[N];
for (int i = 0; i < N; i++)
{
Console.WriteLine($"Nhap dinh {i + 1}:");
dg.dsDinh[i] = XL_DIEM.NhapDiem();
}
return(dg);
}