Hero's formula
/ˈhɪərəʊz ˌfɔːmjʊlə/(also Heron's formula) Mathematics
noun
A formula giving the area of a triangle in terms of the lengths of its sides.
- For a triangle with sides of length a, b, and c, the area A = √s(s − a)(s − b)(s − c), where s = ½(a + b + c)..
Origin
Late 19th century. From the genitive of the name of Hero (also Heron) of Alexandria (fl. c a.d. 60), scientist and engineer, who described the formula.