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

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

The equation of the cirele which passes through the point (1, 1) and touches the circle x^2+y^2+4x-6y-3=0 at the point (2, 3) on it is

Find the equation of a circle with center (4, 3) touching the circle x^2+y^2=1

Find the equation of the circle which touch the line 2x-y=1 at (1,1) and line 2x+y=4

Find the equations of the circles passing through the point (-4,3) and touching the lines x+y=2 and x-y=2

Find the equation of the circle described on the chord 3x+y+5=0 of the circle x^(2)+y^(2)=16 as diameter.

Find the circle of minimum radius which passes through the point (4, 3) and touches the circle x^2+y^2=4 externally.

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_____________