" Tangents drawn from the origin to the circle "x^(2)+y^(2)-2ax-2by+a^(2)=0" are perpendicular if "

Show tha the tangents drawn from the origin in to the circle x^(2)+y^(2)-2ax-2by+a^(2)=0 are perpendicular if a^(2)-b^(2)=0 .

Show tha the tangents drawn from the origin in to the circle x^(2)+y^(2)-2ax-2by+a^(2)=0 are perpendicular if a^(2)-b^(2)=0 .

Tangents drawn from the origin to the circle x^(2)+y^(2)+2gx+2fy+f^(2)=0 are perpendicular if

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

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

The tangents drawn from the origin to the circle : x^2+y^2-2gx-2fy+f^2=0 are perpendicular if:

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

The tangents drawn from origin to the circle x^2+y^2-2ax-2by+b^2 are perpendicular to each other, if a) a-b =1 b) a+b=1 c) a^2-b^2 =0 d) a^2+b^2=1

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