Heron's formula is used to find the area of a triangle when the altitude is not known. The first part of Heon's formula is calculating "S" The next step is to take "S" and plug it into the area formula. The video works out an example problem. Heron's formula looks complicated but is is really pretty easy to use.

## Geometry Help/Area Triangle/Heron's formula

Heron's formula can be used to find the area of a triangle, if you know three sides of a triangle. but you don't know the altitude.

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