Find the coodition that the straight line `lx+my+n=0` is a normal to the
circle `x^(2)+y^(2)+2gx+2fy+c=0`

Find the coodition that the straight line lx+my+n=0 is a normal to the ellipse (x^(2))/(a^(2))+(y^(2))/(b^(2))=1

Find the condition for the line Ix+my+ n = 0 is a normal to the circle x^2 + y^2 + 2gx + 2fy + c = 0 .

The line ax+by+by+c=0 is normal to the circle x^(2)+y^(2)+2gx+2fy+d=0, if

Find the condition for the line lx + my + n =0 is a tangent to the circle x^(2) + y^(2) = a^(2)

The line ax+by+c=0 is normal to the circle x^(2)+y^(2)+2gy+2fy+d=0, if

Find the condition, that the line lx + my + n = 0 may be a tangent to the circle (x - h)^(2) + (y - k)^(2) = r^(2) .

Find the condition that line lx + my - n = 0 will be a normal to the hyperbola x^(2)/a^(2) - y^(2)/b^(2) = 1 .

Find the condition that line lx + my - n = 0 will be a normal to the hyperbola x^(2)/a^(2) - y^(2)/b^(2) = 1 .

Find the condition for the line lx+my+n=0 to be a normal to the ellipse x^2/a^2+y^2/b^2=1