Heron's formula can be applied to any type of triangle. Since, Heron's formula is used to calculate the area of a triangle and every type of triangle in this world will have some area. So, for a triangle, if the three sides are known, you can directly calculate the area using Heron's formula. If for any type of triangle, you know the altitude, you can directly calculate the area by using 12∗altitude∗corresponding base.