If the pair of straight lines `x^2 - y^2 + 2x + 1 = 0` meet the y-axis in A and B, AB equals to

The pair of straight lines x+2y-1=0,x+2y-5=0 are.

If the pair of straight lines xy - x - y + 1 = 0 and the line ax+2y-3 = 0 are concurrent then a=

The tangent at any point theta on the hyperbola (x^(2))/(a^(2))-(y^(2))/(b^(2))=1 meet the pair of straight lines b^(2)x^(2)-a^(2)y^(2)=0 at the points A and B. Then length of the line segment AB is

If the pair of straight lines xy - x - y +1=0 & the line ax+2y-3=0 are concurrent then a =

The line x+y=k meets the pair of straight lines x^(2)+y^(2)-2x-4y+2=0 in two points A and B. If O is the origin and angleAOB=90^(@) then the value of kgt1 is

The angle between the pair of straight lines x^(2)-y^(2)-2y-1=0 is

The angle between the pair of straight lines x^(2)-y^(2)-2y-1=0 is

If the pair of straight lines xy-x-y+1=0 & the line ax+2y-3=0 are concurrent then a=