From the point `P(-1,-2)`,PQ and PR are the tangents drawn to the circle `x^(2)+y^(2)-6x-8y=0` .Then angle subtended by QR at the centre of the circle is

From point P(8,27) tangents PQ and PR are drawn to the ellipse (x^(2))/(4)+(y^(2))/(9)=1. Then, angle subtended by QR at origin is

From the point P(4,-4) tangents PA and PB are drawn to the circle x^(2)+y^(2)-6x+2y+5=0 whose centre is C then Length of AB

From the point P(16,7), tangents PQ and PR are drawn to the circle x^(2)+y^(2)-2x-4y-20=0 If C is the centre of the circle,then area of quadrilateral PQCR is

If OA and OB be the tangents to the circle x^(2)+y^(2)-6x-8y+21=0 drawn from the origin O, then AB

A point on the line x=3 from which the tangents drawn to the circle x^(2)+y^(2)=8 are at right angles is

Angle between tangents drawn to circle x^(2)+y^(2)=20 from the point (6,2) is

The locus of a point such that the tangents drawn from it to the circle x^(2)+y^(2)-6x-8y=0 are perpendicular to each other is

if P is a variable point and PQ and PRare the tangent drawn to the circle x^(2)+y^(2)=9. Let QR be always touching the circle x^(+)y^(2)=4 then locus of P is