Uses Crt;
Var
x1, x2, x3, y1, y2, y3: real;
Begin
ClrScr;
Write('x1=');
Readln(x1);
Write('y1=');
Readln(y1);
Write('x2=');
Readln(x2);
Write('y2=');
Readln(y2);
Write('x3=');
Readln(x3);
Write('y3=');
Readln(y3);
If (x3 - x1) * (y2 - y1) - (y3 - y1) * (x2 - x1) = 0 Then
Write('лежит')
Else
Write('не лежит');
Readln;
End.