vba, 76
Function r(a,b,c) s=(a+b+c)/2:r=(a*b*c)/(8*(s-a)*(s-b)*(s-c)) End Function Call with
?r(3,4,5)
or in excel with
=r(5,12,13)
Function r(a,b,c) s=(a+b+c)/2:r=(a*b*c)/(8*(s-a)*(s-b)*(s-c)) End Function Call with
?r(3,4,5)
or in excel with
=r(5,12,13)