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 the tangents AB and AQ are drawn from the point A(3, -1) to the circle x^(2)+y^(2)-3x+2y-7=0 and C is the centre of circle, then the area of quadrilateral APCQ 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(3, 4) tangents PA and PB are drawn to the circle x^(2)+y^(2)+4x+6y-12=0 . The area of Delta PAB in square units, is

If OA and OB are the tangents from the origin to the circle x^(2)+y^(2)+2gx+2fy+c=0 and C is the centre of the circle,the area of the quadrilateral OACB is

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

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

Tangent PQ and PR are drawn to the circle x^2 + y^2 = a^2 from the pint P(x_1, y_1) . Find the equation of the circumcircle of DeltaPQR .