Нельзя преобразовать тип Tuple к real.


program t1;
var a,b,c,S,x1,x2,x3,y1,y2,y3:real;
begin
write('Введите a,b,c форма: a(x1,y1)');
read (a,b,c);
a:=(x1,y1);
b:=(x2,y2);
c:=(x3,y3);
S:=1/4*sqrt((a+b+c)*(a+b-c)(a+c-b)(b+c-a));
writeln ('Площадь треугольника равна ',S:7:3);
end.
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