The chord of contact of tangents from a point `P` to a circle passes through `Qdot` If `l_1a n dl_2` are the length of the tangents from `Pa n dQ` to the circle, then `P Q` is equal to `(l_1+l_2)/2` (b) `(l_1-l_2)/2` `sqrt(l1 2+l2 2)` (d) `2sqrt(l1 2+l2 2)`

The chord of contact of tangents from a point P to a circle passes through Q. If l_(1) and l_(2) are the length of the tangents from P and Q to the circle,then PQ is equal to (l_(1)+l_(2))/(2) (b) (l_(1)-l_(2))/(2)sqrt(l_(1)^(2)+l_(2)^(2))(d)2sqrt(l_(1)^(2)+l_(2)^(2))

If L_1 and L_2, are the length of the tangent from (0, 5) to the circles x^2 + y^2 + 2x-4=0 and x^2 + y^2-y + 1 = 0 then

The lengths of the tangents from the points A and B to a circle are l_(1) and l_(2) respectively. If points are conjugate with respect to the circle, then AB^(2)=

l and m are the lengths of the tangents from the origin and the point (9, -1) to the circle x^(2) + y^(2) + 18x - 2y + 32 = 0 The value of 17(l^(2) + m^(2)) is equal to ________ .

The line l_(1) passing through the point (1,1) and the l_(2), passes through the point (-1,1) If the difference of the slope of lines is 2. Find the locus of the point of intersection of the l_(1) and l_(2)

Two tangents to an ellispse x^(2)+2y^(2)=2 are drawn which intersect at right angles,let l_(1) and l_(2) be the intercepts on these tangents made by the circle x^(2)+y^(2)=2 , then l_(1)^(2)+l_(2)^(2) is equal to________

The distance between two points P and Q is d and the lengths of projections of PQ on the coordinate planes are l_(1),l_(2),l_(3) then (l_(1)+l_(2)^(2)+l_(3)^(2))/(d^(2)

If a rectangle has length L and the width is one-half of the length,then the area of the rectangle is (a) L( b) L^(2)( c) (1)/(2)L^(2)( d ) (1)/(4)L^(2)( e) 2L

From a point (2,alpha) tangents are drawn to the same branch of hyperbola (x^(2))/25-(y^(2))/16=1 , then the range of alpha epsilon(l_(1),l_(2)) then l_(2) is equal to_________