Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse
Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse: Overview
This topic covers concepts, such as Properties of Conjugate Diameters of an Ellipse, Chord of Contact to an Ellipse, Diameter of an Ellipse, Equation of the Polar of a Point with Respect to an Ellipse, Conjugate Diameters of an Ellipse, etc.
Important Questions on Pair of Tangents, Chord of Contact and Chord with Midpoint of an Ellipse
Tangents are drawn to the ellipse at points where it is intersected by the line . Find the point of intersection of tangents at these points.

Find the equation of the diameter of an ellipse conjugate to the diameter

Find the equation of the diameter of an ellipse conjugate to the diameter

The line intersects the ellipse at two points. The tangents to the ellipse at these two points intersect at the point.

From any point on the line tangents are drawn to the ellipse It is given that chord of contact passes through a fixed point. Then the number of integral values of for which the fixed point always lies inside the ellipse is

Which of the following options is most revalent?
Statement 1:
Let be any point on a directrix of an ellipse. Then, the chords of contact of the point with respect to the ellipse and its auxiliary circle intersect at the corresponding focus.
Statement 2:
The equation of the family of lines passing through the point of intersection of lines and is .

If tangent to parabola intersect the ellipse at and and locus of point of intersection of tangents at and is a conic , then

If line is intersecting ellipse at two distinct points and , then point of intersection of tangents at and :

Cotyledons are also called-

From the point pair of tangents and are drawn to the ellipse If intersects -axis at and -axis at , then

Let from a point chords of contact are drawn to the ellipse where all these chords touch the ellipse . Then, the perimeter (in units) of the locus of point is

The line interesects the ellipse at two points. The point of intersection of the tangents to the ellipse at these points is

If the point of intersection of the ellipses and be at the extremities of the conjugate diameters of the former, then -

Tangents are drawn from the points on the line to , then all the chords of contact pass through a fixed point, whose co-ordinates are -

The length of the diameter of the ellipse perpendicular to the asymptotes of the hyperbola passing through the first and third quadrant is

The chord of contact of the tangents drawn from to an ellipse touches the circle , then the locus of is

The chord of contact of the tangents drawn from to an ellipse touches the circle , then the locus of is:

If the chords of constant of tangents from two points and to the ellipse are at right angles, then is equal to

If a variable tangent of the circle intersects the ellipse at points and , then the locus of the point of intersection of tangent at and is

If and are the equations of a pair of conjugate diameters of an ellipse, then the eccentricity of the ellipse is
