program prim_1;
var a,b,c,p:real;
begin
    write('введите a=');readln(a);
    write('введите b=');readln(b);
    write('введите c=');readln(c);
    p:=(a+b+c)/2;
    writeln(2*arctan(sqrt(((p-b)*(p-c))/(p*(p-a)))));
    writeln(2*arctan(sqrt(((p-a)*(p-c))/(p*(p-b)))));
    writeln(2*arctan(sqrt(((p-a)*(p-b))/(p*(p-c)))));
    readln;
end.