from a point P (a,b),two tangents PQ and PR are drawn to a circle x2+y2-a2=0.Find the equation of the circumcircle of triangle PQR

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Please find below the solution to the asked query:

We havePa,bEquation of chord of contact QR from Pa,b to circle x2+y2-a2=0 will beT=0ax+by-a2=0As you can see a,0 lies on chord of contact as well as circle.So the circumcircle will pass through a,0 and a,b

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