Co-ordinates of the centre of a circle, whose radius is 2 unit and which touches the pair of lines ines `x^2-y^2-2x + 1 = 0` is (are)

Centre of the circle whose radius is 3 and which touches internally the circle x^(2)+y^(2)-4x-6y-12=0 at the point (-1 -1) is

Find the equation of the circle whose radius is 5a n d which touches the circle x^2+y^2-2x-4y-20=0 externally at the point (5,5)dot

Find the equation of the circles whose radius is 4 and whish is concentric with the circle x^(2)+y^(2)+2x-6y=0

Difference in values of the radius of a circle whose center is at the origin and which touches the circle x^2+y^2-6x-8y+21=0 is_____________

The radius of a circle, having minimum area, which touches the curve y=4-x^2 and the lines y=|x| is :

Find the equation of the circle having radius 5 and which touches line 3x+4y-11=0 at point (1, 2).

The radius of the circle having centre at (2,1) whose one of the chords is diameter of the circle x^2 + y^2 - 2x - 6y + 6 = 0 is

The minimum area of circle which touches the parabolas y=x^(2)+1andy^(2)=x-1 is