Finding the area of a triangle can be as
simple as plugging numbers into the well known formula for the
area of a triangle:
But how do you find the area of a triangle
when you do not know the height of the triangle?
A Greek engineer and geometer, Hero (or Heron)
of Alexandria, who lived in the first century 10  75, is
credited with discovering a means of finding the area of a
triangle when the height is not known.
Heron's formula:

where a,
b and
c are
the sides of the triangle, and
s is called
the semiperimeter.
