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The line y = mx ±√(a2 m2+b2) is a tangent to the given ellipse for all m. Suppose it passes through (h, k).
⇒ k - mh = √(a2m2 + b2 ) ⇒ k2 + m2h2 - 2hkm = a2m2 + b2
⇒ m2 (h2 - a2) - 2hkm + k2 - b2 = 0.
If the tangents are at right angles, then m1m2 = -1.
⇒ (k2-b2)/(h2-a2 ) = - 1 ⇒ h2 + k2 = a2 + b2.
Hence the locus of the point (h, k) is x2 + y2 = a2 + b2 which is a circle. This circle is called the Director Circle of the ellipse.
hence radius = sqrt(a^2 + b^2)
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