The range of values of `lambda` for which the circles `x^(2)+y^(2)=4` and `x^(2)+y^(2)-4lambda x + 9 = 0` have two common tangents, is

If the cirles x^(2)+y^(2)=2 and x^(2)+y^(2)-4x-4y+lambda=0 have exactly three real common tangents then lambda=

The value of lambda for which the circle x^(2)+y^(2)+2lambdax+6y+1=0 intersects the circle x^(2)+y^(2)+4x+2y=0 orthogonally, is

The value of lambda for which the circle x^(2)+y^(2)+2lambdax+6y+1=0 intersects the circle x^(2)+y^(2)+4x+2y=0 orthogonally, is

If 2x-3y=0 is the equation of the common chord of the circles x^(2)+y^(2)+4x=0 and x^(2)+y^(2)+2 lambda y=0 then the value of lambda is

If the two circles x^(2) + y^(2) =4 and x^(2) +y^(2) - 24x - 10y +a^(2) =0, a in I , have exactly two common tangents then the number of possible integral values of a is :

For what value of lambda, does the line 3x+4y=lambda touch the circle x^(2)+y^(2)=10x

The line 4y-3x+lambda=0 touches the circle x^(2)+y^(2)-4x-8y-5=0 then lambda=

If the angle between the circles x^(2) +y^(2) +4x - 5 = 0 and x^(2) +y^(2) +2lambda y- 4 = 0 "is" (pi)/(3), " then " lambda =