Chord of contact from a point

Find the equation of the chord of contact of the point (3,1) to the ellipse x^2+9y^2=9 . Also find the mid-point of this chord of contact.

Length of the chord of contact drawn from the point (-3,2) to the parabola y^(2)=4x is

Chord of contact of tangents drawn from the point M(h, k) to the ellipse x^(2) + 4y^(2) = 4 intersects at P and Q, subtends a right angle of the centre theta

If the chord of contact of tangents from a point P to a given circle passes through Q , then the circle on P Q as diameter.

The chord of contact of tangents from 3 points A, B, C to the circle x^(2) + y^(2) =4 are concurrent, then the points A, B and C are:

The chord of contact of tangents from three points P, Q, R to the circle x^(2) + y^(2) = c^(2) are concurrent, then P, Q, R