- #1

Heron's name is indeed imbedded in the formula name, but he was not the first.

Archimededes, in about the year 250 B.C., was working on the properties of the circle, and was investigating the number pi.

In his process he created the formula for the area of a triangle which helped him in his understanding of circles - as is witnessed by calculus properties of the circle and trig functions.