The equation of tangents drawn from the origin to the circle`x^2+y^2-2rx-2hy+h^2=0`

The equations of the tangents drawn from the origin to the circle x^(2) +y^(2) +2r x +2hy+h^(2) =0 , are :

The tangents drawn from the origin to the circle x^2+y^2-2rx-2hy+h^2=0 are perpendicular if

Combined equation to the pair of tangents drawn from the origin to the circle x^(2)+y^(2)+4x+6y+9=0 is

If tangents are drawn from origin to the circle x^(2)+y^(2)-2x-4y+4=0, then

A pair of tangents are drawn from the origin to the circle x^(2)+y^(2)+20(x+y)+20=0, The equation of pair of tangent is

A pair of tangents are drawn from the origin to the circle x^(2)+y^(2)+20(x+y)+20=0 Then find its equations.