uses crt;

var a,b,c,p,d: integer;

begin

assign (input,'tamgiac.inp');  reset(input);

assign (output,'tamgiac.out');  rewrite(output);

read(a,b,c);

p:=(a+b+c)/2;

d:=sqrt(p*(p-a)*(p-b)*(p-c));

writeln ('Chu vi: ',a+b+c);

writeln ('Dien tich: ',sqrt(p*(p-a)*(p-b)*(p-c)):3:4);

writeln ('Duong cao canh a: 2*(dt/a):3:4); 

writeln ('Duong cao canh b: 2*(dt/b):3:4); 

writeln ('Duong cao canh c: 2*(dt/c):3:4); 

readln;

end.

const f1='TAMGIAC.INP';
      f2='TAMGIAC.OUT';
var a,b,c,S,P:real;
    f:text;
Begin
        assign(f,f1);reset(f);
        read(f,a,b,c);
        close(f);
        assign(f,f2);rewrite(f);
        if (a<b+c) and (b<c+a) and (c<b+a) then
        begin
                P:=(a+b+c)/2;
                S:=sqrt(p*(p-a)*(p-b)*(p-c));
                writeln(f,'Chu vi = ',P*2:2:1);
                writeln(f,'Dien tich = ',S:2:1);
                writeln(f,'Duong cao canh a: ',S*2/a:2:1);
                writeln(f,'Duong cao canh b: ',S*2/b:2:1);
                write(f,'Duong cao canh c: ',S*2/c:2:1);
        end
        else write(f,'khong phai tam giac');
        close(f);
End.