Program example;var a, b, c:integer;function gero(a,b,c:integer):double;var p:double;begin p:=(a+b+c)/2; gero:=p*(p-a)*(p-b)*(p-c);end;begin write('Введите A'); readln(a); write('Введите B '); readln(b); write('Введите C'); readln(c); writeln(gero(a,b,c)); readkey;end.