[" A circle passes through the focus of parabola "x^(2)=4y." If the circle touches the parabola a "],[(6,9)," then square of its radius is "]

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=

A circle whose centre is (4,-1) passes through the focus of the parabola x^2+16y=0 . Show that the circle touches the directrix of the parabola.

If a circle drawn with radius 1 unit and whose centre is the focus of the parabola y^(2)=4x touches the parabola at

The equation of the circle drawn with the focus of the parabola (x – 1)^(2) - 8y = 0 as its centre and touching the parabola at its vertex is

Radius of the largest circle passing through the focus of the parabola y^2 = 4x and lying inside the parabola is…

The equation of the circle drawn with the focus of the parabola (x-1)^(2)-8y=0 as its centre touching the parabola at its vertex is:

A circle of radius 4 drawn on a chord of the parabola y^(2)=8x as diameter touches the axis of the parabola. Then the slope of the chord is