If `ax^2+2hxy+by^2+2gx+2fy+c=0` represents two parallel lines then prove that `h^2=ab`.

If ax^2+2hxy+by^2+2gx+2fy+c=0 represents two parallel lines then prove that af^2=bg^2 .

If ax^2+2hxy+by^2+2gx+2fy+c=0 represents two parallel lines then prove that the distance between the parallel lines is 2sqrt((g^2-ac)/(a(a+b)))" or "2sqrt((f^2-bc)/(b(a+b))) .

If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents parallel lines then

If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents two parallel straight lines, then

If ax^(2)+2hxy+by^(2)+2gx+2fy+c=0 represents two parallel straight lines, then