public static double Chuvi(Diem A, Diem B, Diem C)
{
double cv = 0;
double AB, BC, AC;
AB = Diem.Khoangcach(A, B);
BC = Diem.Khoangcach(B, C);
AC = Diem.Khoangcach(A, C);
cv = AB + BC + AC;
return(cv);
}
public static double Dientich(Diem A, Diem B, Diem C)
{
double dt;
float p;
double AB, BC, AC;
AB = Diem.Khoangcach(A, B);
BC = Diem.Khoangcach(B, C);
AC = Diem.Khoangcach(A, C);
p = (float)(AB + BC + AC) / 2;
dt = Math.Sqrt(p * (p - AB) * (p - BC) * (p - AC));
return(dt);
}
