Let the equation of two concentric circles is x2+y2−2x+4y+λ=0. If a chord of first circle is tangent to second circle and normal to a circle passing through centre of these circles and having a centre at (2,−1) is also touching first circle. Then length of chord with respect to first circle is:

Let the equation of two concentric circles is x2+y2−2x+4y+λ=0. If a

1.	Let the equation of two concentric circles is x2+y2−2x+4y+λ=0. If a chord of first circle is tangent to second circle and normal to a circle passing through centre of these circles and having a centre at (2,−1) is also touching first circle. Then length of chord with respect to first circle is:
Answer» Let the equation of two concentric circles is $x^{2} + y^{2} - 2 x + 4 y + λ = 0$ . If a chord of first circle is tangent to second circle and normal to a circle passing through centre of these circles and having a centre at $(2, - 1)$ is also touching first circle. Then length of chord with respect to first circle is: