[" The radius of circle passes through "],[" focus of "x^(2)=4y" and touches it at point "],[(6,9)" is "k sqrt(10)" the "k=]

The radius of circle which passes through the focus of parabola x^(2)=4y and touches it at point (6,9) is k sqrt(10), then k=

Radius of the circle that passes through the origin and touches the parabola y^2=4a x at the point (a ,2a) is

Radius of the largest circle which passes through the focus of the parabola y^2=4x and contained in it, is

Radius of the largest circle which passes through the focus of the parabola y^2=4x and contained in it, is

Radius of the largest circle which passes through the focus of the parabola y^2=4x and contained in it, is

Radius of the circle that passes through the origin and touches the parabola y^2=4a x at the point (a ,2a) is (a) 5/(sqrt(2))a (b) 2sqrt(2)a (c) sqrt(5/2)a (d) 3/(sqrt(2))a

Radius of the circle that passes through the origin and touches the parabola y^2=4a x at the point (a ,2a) is (a) 5/(sqrt(2))a (b) 2sqrt(2)a (c) sqrt(5/2)a (d) 3/(sqrt(2))a

Find the radius of the largest circle,which passes through the focus of the parabola y^(2)=4(x+y) and is also contained in it.